[pypy-commit] pypy default: hg merge fast-gil
arigo
noreply at buildbot.pypy.org
Wed Jun 25 21:35:51 CEST 2014
Author: Armin Rigo <arigo at tunes.org>
Branch:
Changeset: r72234:dd8a43cdd8d5
Date: 2014-06-25 21:33 +0200
http://bitbucket.org/pypy/pypy/changeset/dd8a43cdd8d5/
Log: hg merge fast-gil
A faster way to handle the GIL, particularly in JIT code. The GIL
is now a composite of two concepts: a global number (it's just set
from 1 to 0 and back around CALL_RELEASE_GIL), and a real mutex. If
there are threads waiting to acquire the GIL, one of them is
actively checking the global number every 0.1 ms to 1 ms.
diff --git a/pypy/module/thread/gil.py b/pypy/module/thread/gil.py
--- a/pypy/module/thread/gil.py
+++ b/pypy/module/thread/gil.py
@@ -7,7 +7,7 @@
# all but one will be blocked. The other threads get a chance to run
# from time to time, using the periodic action GILReleaseAction.
-from rpython.rlib import rthread
+from rpython.rlib import rthread, rgil
from pypy.module.thread.error import wrap_thread_error
from pypy.interpreter.executioncontext import PeriodicAsyncAction
from pypy.module.thread.threadlocals import OSThreadLocals
@@ -25,8 +25,7 @@
use_bytecode_counter=True)
def _initialize_gil(self, space):
- if not rthread.gil_allocate():
- raise wrap_thread_error(space, "can't allocate GIL")
+ rgil.gil_allocate()
def setup_threads(self, space):
"""Enable threads in the object space, if they haven't already been."""
@@ -71,15 +70,13 @@
def before_external_call():
# this function must not raise, in such a way that the exception
# transformer knows that it cannot raise!
- e = get_errno()
- rthread.gil_release()
- set_errno(e)
+ rgil.gil_release()
before_external_call._gctransformer_hint_cannot_collect_ = True
before_external_call._dont_reach_me_in_del_ = True
def after_external_call():
e = get_errno()
- rthread.gil_acquire()
+ rgil.gil_acquire()
rthread.gc_thread_run()
after_thread_switch()
set_errno(e)
@@ -97,7 +94,7 @@
# explicitly release the gil, in a way that tries to give more
# priority to other threads (as opposed to continuing to run in
# the same thread).
- if rthread.gil_yield_thread():
+ if rgil.gil_yield_thread():
rthread.gc_thread_run()
after_thread_switch()
do_yield_thread._gctransformer_hint_close_stack_ = True
diff --git a/rpython/jit/backend/llsupport/assembler.py b/rpython/jit/backend/llsupport/assembler.py
--- a/rpython/jit/backend/llsupport/assembler.py
+++ b/rpython/jit/backend/llsupport/assembler.py
@@ -303,28 +303,39 @@
@staticmethod
@rgc.no_collect
- def _release_gil_asmgcc(css):
- # similar to trackgcroot.py:pypy_asm_stackwalk, first part
- from rpython.memory.gctransform import asmgcroot
- new = rffi.cast(asmgcroot.ASM_FRAMEDATA_HEAD_PTR, css)
- next = asmgcroot.gcrootanchor.next
- new.next = next
- new.prev = asmgcroot.gcrootanchor
- asmgcroot.gcrootanchor.next = new
- next.prev = new
- # and now release the GIL
- before = rffi.aroundstate.before
- if before:
- before()
+ def _reacquire_gil_asmgcc(css, old_rpy_fastgil):
+ # Before doing an external call, 'rpy_fastgil' is initialized to
+ # be equal to css. This function is called if we find out after
+ # the call that it is no longer equal to css. See description
+ # in translator/c/src/thread_pthread.c.
- @staticmethod
- @rgc.no_collect
- def _reacquire_gil_asmgcc(css):
- # first reacquire the GIL
- after = rffi.aroundstate.after
- if after:
- after()
- # similar to trackgcroot.py:pypy_asm_stackwalk, second part
+ if old_rpy_fastgil == 0:
+ # this case occurs if some other thread stole the GIL but
+ # released it again. What occurred here is that we changed
+ # 'rpy_fastgil' from 0 to 1, thus successfully reaquiring the
+ # GIL.
+ pass
+
+ elif old_rpy_fastgil == 1:
+ # 'rpy_fastgil' was (and still is) locked by someone else.
+ # We need to wait for the regular mutex.
+ after = rffi.aroundstate.after
+ if after:
+ after()
+ else:
+ # stole the GIL from a different thread that is also
+ # currently in an external call from the jit. Attach
+ # the 'old_rpy_fastgil' into the chained list.
+ from rpython.memory.gctransform import asmgcroot
+ oth = rffi.cast(asmgcroot.ASM_FRAMEDATA_HEAD_PTR, old_rpy_fastgil)
+ next = asmgcroot.gcrootanchor.next
+ oth.next = next
+ oth.prev = asmgcroot.gcrootanchor
+ asmgcroot.gcrootanchor.next = oth
+ next.prev = oth
+
+ # similar to trackgcroot.py:pypy_asm_stackwalk, second part:
+ # detach the 'css' from the chained list
from rpython.memory.gctransform import asmgcroot
old = rffi.cast(asmgcroot.ASM_FRAMEDATA_HEAD_PTR, css)
prev = old.prev
@@ -334,42 +345,28 @@
@staticmethod
@rgc.no_collect
- def _release_gil_shadowstack():
- before = rffi.aroundstate.before
- if before:
- before()
-
- @staticmethod
- @rgc.no_collect
def _reacquire_gil_shadowstack():
+ # Simplified version of _reacquire_gil_asmgcc(): in shadowstack mode,
+ # 'rpy_fastgil' contains only zero or non-zero, and this is only
+ # called when the old value stored in 'rpy_fastgil' was non-zero
+ # (i.e. still locked, must wait with the regular mutex)
after = rffi.aroundstate.after
if after:
after()
- @staticmethod
- def _no_op():
- pass
-
- _NOARG_FUNC = lltype.Ptr(lltype.FuncType([], lltype.Void))
- _CLOSESTACK_FUNC = lltype.Ptr(lltype.FuncType([rffi.LONGP],
- lltype.Void))
+ _REACQGIL0_FUNC = lltype.Ptr(lltype.FuncType([], lltype.Void))
+ _REACQGIL2_FUNC = lltype.Ptr(lltype.FuncType([rffi.CCHARP, lltype.Signed],
+ lltype.Void))
def _build_release_gil(self, gcrootmap):
- if gcrootmap is None:
- releasegil_func = llhelper(self._NOARG_FUNC, self._no_op)
- reacqgil_func = llhelper(self._NOARG_FUNC, self._no_op)
- elif gcrootmap.is_shadow_stack:
- releasegil_func = llhelper(self._NOARG_FUNC,
- self._release_gil_shadowstack)
- reacqgil_func = llhelper(self._NOARG_FUNC,
+ if gcrootmap is None or gcrootmap.is_shadow_stack:
+ reacqgil_func = llhelper(self._REACQGIL0_FUNC,
self._reacquire_gil_shadowstack)
+ self.reacqgil_addr = self.cpu.cast_ptr_to_int(reacqgil_func)
else:
- releasegil_func = llhelper(self._CLOSESTACK_FUNC,
- self._release_gil_asmgcc)
- reacqgil_func = llhelper(self._CLOSESTACK_FUNC,
+ reacqgil_func = llhelper(self._REACQGIL2_FUNC,
self._reacquire_gil_asmgcc)
- self.releasegil_addr = self.cpu.cast_ptr_to_int(releasegil_func)
- self.reacqgil_addr = self.cpu.cast_ptr_to_int(reacqgil_func)
+ self.reacqgil_addr = self.cpu.cast_ptr_to_int(reacqgil_func)
def _is_asmgcc(self):
gcrootmap = self.cpu.gc_ll_descr.gcrootmap
diff --git a/rpython/jit/backend/llsupport/callbuilder.py b/rpython/jit/backend/llsupport/callbuilder.py
--- a/rpython/jit/backend/llsupport/callbuilder.py
+++ b/rpython/jit/backend/llsupport/callbuilder.py
@@ -1,4 +1,7 @@
from rpython.rlib.clibffi import FFI_DEFAULT_ABI
+from rpython.rlib import rgil
+from rpython.rtyper.lltypesystem import lltype, rffi
+
class AbstractCallBuilder(object):
@@ -42,20 +45,21 @@
def emit_call_release_gil(self):
"""Emit a CALL_RELEASE_GIL, including calls to releasegil_addr
and reacqgil_addr."""
+ fastgil = rffi.cast(lltype.Signed, rgil.gil_fetch_fastgil())
self.select_call_release_gil_mode()
self.prepare_arguments()
self.push_gcmap_for_call_release_gil()
- self.call_releasegil_addr_and_move_real_arguments()
+ self.call_releasegil_addr_and_move_real_arguments(fastgil)
self.emit_raw_call()
self.restore_stack_pointer()
- self.move_real_result_and_call_reacqgil_addr()
+ self.move_real_result_and_call_reacqgil_addr(fastgil)
self.pop_gcmap()
self.load_result()
- def call_releasegil_addr_and_move_real_arguments(self):
+ def call_releasegil_addr_and_move_real_arguments(self, fastgil):
raise NotImplementedError
- def move_real_result_and_call_reacqgil_addr(self):
+ def move_real_result_and_call_reacqgil_addr(self, fastgil):
raise NotImplementedError
def select_call_release_gil_mode(self):
diff --git a/rpython/jit/backend/llsupport/test/test_gc_integration.py b/rpython/jit/backend/llsupport/test/test_gc_integration.py
--- a/rpython/jit/backend/llsupport/test/test_gc_integration.py
+++ b/rpython/jit/backend/llsupport/test/test_gc_integration.py
@@ -2,6 +2,7 @@
""" Tests for register allocation for common constructs
"""
+import py
import re
from rpython.jit.metainterp.history import TargetToken, BasicFinalDescr,\
JitCellToken, BasicFailDescr, AbstractDescr
@@ -780,6 +781,9 @@
assert rffi.cast(JITFRAMEPTR, cpu.gc_ll_descr.write_barrier_on_frame_called) == frame
def test_call_release_gil(self):
+ py.test.skip("xxx fix this test: the code is now assuming that "
+ "'before' is just rgil.release_gil(), and 'after' is "
+ "only needed if 'rpy_fastgil' was not changed.")
# note that we can't test floats here because when untranslated
# people actually wreck xmm registers
cpu = self.cpu
diff --git a/rpython/jit/backend/x86/callbuilder.py b/rpython/jit/backend/x86/callbuilder.py
--- a/rpython/jit/backend/x86/callbuilder.py
+++ b/rpython/jit/backend/x86/callbuilder.py
@@ -25,9 +25,6 @@
# arguments, we need to decrease esp temporarily
stack_max = PASS_ON_MY_FRAME
- # set by save_result_value()
- tmpresloc = None
-
def __init__(self, assembler, fnloc, arglocs,
resloc=eax, restype=INT, ressize=WORD):
AbstractCallBuilder.__init__(self, assembler, fnloc, arglocs,
@@ -41,7 +38,6 @@
self.current_esp = 0 # 0 or (usually) negative, counted in bytes
def select_call_release_gil_mode(self):
- """Overridden in CallBuilder64"""
AbstractCallBuilder.select_call_release_gil_mode(self)
if self.asm._is_asmgcc():
from rpython.memory.gctransform import asmgcroot
@@ -69,12 +65,10 @@
if self.ressize == 0:
return # void result
# use the code in load_from_mem to do the zero- or sign-extension
- srcloc = self.tmpresloc
- if srcloc is None:
- if self.restype == FLOAT:
- srcloc = xmm0
- else:
- srcloc = eax
+ if self.restype == FLOAT:
+ srcloc = xmm0
+ else:
+ srcloc = eax
if self.ressize >= WORD and self.resloc is srcloc:
return # no need for any MOV
if self.ressize == 1 and isinstance(srcloc, RegLoc):
@@ -100,13 +94,14 @@
self.asm.set_extra_stack_depth(self.mc, 0)
self.asm.pop_gcmap(self.mc)
- def call_releasegil_addr_and_move_real_arguments(self):
- initial_esp = self.current_esp
- self.save_register_arguments()
+ def call_releasegil_addr_and_move_real_arguments(self, fastgil):
+ from rpython.jit.backend.x86.assembler import heap
#
if not self.asm._is_asmgcc():
- # the helper takes no argument
+ # shadowstack: change 'rpy_fastgil' to 0 (it should be
+ # non-zero right now).
self.change_extra_stack_depth = False
+ css_value = imm(0)
else:
from rpython.memory.gctransform import asmgcroot
# build a 'css' structure on the stack: 2 words for the linkage,
@@ -120,73 +115,95 @@
index_of_ebp = css + WORD * (2+asmgcroot.INDEX_OF_EBP)
self.mc.MOV_sr(index_of_ebp, ebp.value) # MOV [css.ebp], EBP
# Save the "return address": we pretend that it's css
- if IS_X86_32:
- reg = eax
- elif IS_X86_64:
- reg = edi
- self.mc.LEA_rs(reg.value, css) # LEA reg, [css]
+ self.mc.LEA_rs(eax.value, css) # LEA eax, [css]
frame_ptr = css + WORD * (2+asmgcroot.FRAME_PTR)
- self.mc.MOV_sr(frame_ptr, reg.value) # MOV [css.frame], reg
+ self.mc.MOV_sr(frame_ptr, eax.value) # MOV [css.frame], eax
# Set up jf_extra_stack_depth to pretend that the return address
# was at css, and so our stack frame is supposedly shorter by
# (PASS_ON_MY_FRAME-JIT_USE_WORDS+1) words
delta = PASS_ON_MY_FRAME - asmgcroot.JIT_USE_WORDS + 1
self.change_extra_stack_depth = True
self.asm.set_extra_stack_depth(self.mc, -delta * WORD)
- # Call the closestack() function (also releasing the GIL)
- # with 'reg' as argument
- if IS_X86_32:
- self.subtract_esp_aligned(1)
- self.mc.MOV_sr(0, reg.value)
- #else:
- # on x86_64, reg is edi so that it is already correct
+ css_value = eax
#
- self.mc.CALL(imm(self.asm.releasegil_addr))
+ self.mc.MOV(heap(fastgil), css_value)
#
if not we_are_translated(): # for testing: we should not access
- self.mc.ADD(ebp, imm(1)) # ebp any more
+ self.mc.ADD(ebp, imm(1)) # ebp any more; and ignore 'fastgil'
+
+ def move_real_result_and_call_reacqgil_addr(self, fastgil):
+ from rpython.jit.backend.x86.assembler import heap
+ from rpython.jit.backend.x86 import rx86
#
- self.restore_register_arguments()
- self.restore_stack_pointer(initial_esp)
-
- def save_register_arguments(self):
- """Overridden in CallBuilder64"""
-
- def restore_register_arguments(self):
- """Overridden in CallBuilder64"""
-
- def move_real_result_and_call_reacqgil_addr(self):
- # save the result we just got (in eax/eax+edx/st(0)/xmm0)
- self.save_result_value()
- # call the reopenstack() function (also reacquiring the GIL)
+ # check if we need to call the reacqgil() function or not
+ # (to acquiring the GIL, remove the asmgcc head from
+ # the chained list, etc.)
+ mc = self.mc
+ restore_edx = False
if not self.asm._is_asmgcc():
- css = 0 # the helper takes no argument
+ css = 0
+ css_value = imm(0)
+ old_value = ecx
else:
from rpython.memory.gctransform import asmgcroot
css = WORD * (PASS_ON_MY_FRAME - asmgcroot.JIT_USE_WORDS)
if IS_X86_32:
- reg = eax
+ assert css >= 16
+ if self.restype == 'L': # long long result: eax/edx
+ mc.MOV_sr(12, edx.value)
+ restore_edx = True
+ css_value = edx
+ old_value = ecx
elif IS_X86_64:
- reg = edi
- self.mc.LEA_rs(reg.value, css)
+ css_value = edi
+ old_value = esi
+ mc.LEA_rs(css_value.value, css)
+ #
+ mc.MOV(old_value, imm(1))
+ if rx86.fits_in_32bits(fastgil):
+ mc.XCHG_rj(old_value.value, fastgil)
+ else:
+ mc.MOV_ri(X86_64_SCRATCH_REG.value, fastgil)
+ mc.XCHG_rm(old_value.value, (X86_64_SCRATCH_REG.value, 0))
+ mc.CMP(old_value, css_value)
+ mc.J_il8(rx86.Conditions['E'], 0)
+ je_location = mc.get_relative_pos()
+ #
+ # Yes, we need to call the reacqgil() function
+ self.save_result_value_reacq()
+ if self.asm._is_asmgcc():
if IS_X86_32:
- self.mc.MOV_sr(0, reg.value)
+ mc.MOV_sr(4, old_value.value)
+ mc.MOV_sr(0, css_value.value)
+ # on X86_64, they are already in the right registers
+ mc.CALL(imm(self.asm.reacqgil_addr))
+ self.restore_result_value_reacq()
#
- self.mc.CALL(imm(self.asm.reacqgil_addr))
+ # patch the JE above
+ offset = mc.get_relative_pos() - je_location
+ assert 0 < offset <= 127
+ mc.overwrite(je_location-1, chr(offset))
#
- if not we_are_translated(): # for testing: now we can accesss
- self.mc.SUB(ebp, imm(1)) # ebp again
+ if restore_edx:
+ mc.MOV_rs(edx.value, 12) # restore this
+ #
+ if not we_are_translated(): # for testing: now we can accesss
+ mc.SUB(ebp, imm(1)) # ebp again
#
# Now that we required the GIL, we can reload a possibly modified ebp
if self.asm._is_asmgcc():
# special-case: reload ebp from the css
from rpython.memory.gctransform import asmgcroot
index_of_ebp = css + WORD * (2+asmgcroot.INDEX_OF_EBP)
- self.mc.MOV_rs(ebp.value, index_of_ebp) # MOV EBP, [css.ebp]
+ mc.MOV_rs(ebp.value, index_of_ebp) # MOV EBP, [css.ebp]
#else:
# for shadowstack, done for us by _reload_frame_if_necessary()
- def save_result_value(self):
+ def save_result_value_reacq(self):
+ """Overridden in CallBuilder32 and CallBuilder64"""
+ raise NotImplementedError
+
+ def restore_result_value_reacq(self):
"""Overridden in CallBuilder32 and CallBuilder64"""
raise NotImplementedError
@@ -239,58 +256,71 @@
resloc = self.resloc
if resloc is not None and resloc.is_float():
# a float or a long long return
- if self.tmpresloc is None:
- if self.restype == 'L': # long long
- # move eax/edx -> xmm0
- self.mc.MOVD32_xr(resloc.value^1, edx.value)
- self.mc.MOVD32_xr(resloc.value, eax.value)
- self.mc.PUNPCKLDQ_xx(resloc.value, resloc.value^1)
- else:
- # float: we have to go via the stack
- self.mc.FSTPL_s(0)
- self.mc.MOVSD_xs(resloc.value, 0)
+ if self.restype == 'L': # long long
+ # move eax/edx -> xmm0
+ self.mc.MOVD32_xr(resloc.value^1, edx.value)
+ self.mc.MOVD32_xr(resloc.value, eax.value)
+ self.mc.PUNPCKLDQ_xx(resloc.value, resloc.value^1)
else:
- self.mc.MOVSD(resloc, self.tmpresloc)
+ # float: we have to go via the stack
+ self.mc.FSTPL_s(0)
+ self.mc.MOVSD_xs(resloc.value, 0)
#
elif self.restype == 'S':
# singlefloat return: must convert ST(0) to a 32-bit singlefloat
# and load it into self.resloc. mess mess mess
- if self.tmpresloc is None:
- self.mc.FSTPS_s(0)
- self.mc.MOV_rs(resloc.value, 0)
- else:
- self.mc.MOV(resloc, self.tmpresloc)
+ self.mc.FSTPS_s(0)
+ self.mc.MOV_rs(resloc.value, 0)
else:
CallBuilderX86.load_result(self)
- def save_result_value(self):
- # Temporarily save the result value into [ESP+4]. We use "+4"
- # in order to leave the word at [ESP+0] free, in case it's needed
+ def save_result_value_reacq(self):
+ # Temporarily save the result value into [ESP+8]. We use "+8"
+ # in order to leave the two initial words free, in case it's needed.
+ # Also note that in this 32-bit case, a long long return value is
+ # in eax/edx, but we already saved the value of edx in
+ # move_real_result_and_call_reacqgil_addr().
if self.ressize == 0: # void return
return
if self.resloc.is_float():
# a float or a long long return
- self.tmpresloc = RawEspLoc(4, FLOAT)
if self.restype == 'L':
- self.mc.MOV_sr(4, eax.value) # long long
- self.mc.MOV_sr(8, edx.value)
+ self.mc.MOV_sr(8, eax.value) # long long
+ #self.mc.MOV_sr(12, edx.value) -- already done by the caller
else:
- self.mc.FSTPL_s(4) # float return
+ self.mc.FSTPL_s(8) # float return
else:
- self.tmpresloc = RawEspLoc(4, INT)
if self.restype == 'S':
- self.mc.FSTPS_s(4)
+ self.mc.FSTPS_s(8)
else:
assert self.restype == INT
assert self.ressize <= WORD
- self.mc.MOV_sr(4, eax.value)
+ self.mc.MOV_sr(8, eax.value)
+
+ def restore_result_value_reacq(self):
+ # Opposite of save_result_value_reacq()
+ if self.ressize == 0: # void return
+ return
+ if self.resloc.is_float():
+ # a float or a long long return
+ if self.restype == 'L':
+ self.mc.MOV_rs(eax.value, 8) # long long
+ #self.mc.MOV_rs(edx.value, 12) -- will be done by the caller
+ else:
+ self.mc.FLDL_s(8) # float return
+ else:
+ if self.restype == 'S':
+ self.mc.FLDS_s(8)
+ else:
+ assert self.restype == INT
+ assert self.ressize <= WORD
+ self.mc.MOV_rs(eax.value, 8)
class CallBuilder64(CallBuilderX86):
ARGUMENTS_GPR = [edi, esi, edx, ecx, r8, r9]
ARGUMENTS_XMM = [xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7]
- DONT_MOVE_GPR = []
_ALL_CALLEE_SAVE_GPR = [ebx, r12, r13, r14, r15]
next_arg_gpr = 0
@@ -303,13 +333,6 @@
res = self.ARGUMENTS_GPR[i]
except IndexError:
return None
- if hint in self.DONT_MOVE_GPR:
- for j in range(i):
- if hint is self.ARGUMENTS_GPR[j]:
- break
- else:
- self.ARGUMENTS_GPR[i] = hint
- res = hint
return res
def _unused_xmm(self):
@@ -320,51 +343,6 @@
except IndexError:
return None
- def _permute_to_prefer_unused_registers(self, lst):
- # permute 'lst' so that it starts with registers that are not
- # in 'self.already_used', and ends with registers that are.
- N = len(lst)
- i = 0
- while i < N:
- reg = lst[i]
- if reg in self.already_used:
- # move this reg to the end, and decrement N
- N -= 1
- assert N >= i
- lst[N], lst[i] = lst[i], lst[N]
- else:
- i += 1
-
- def select_call_release_gil_mode(self):
- CallBuilderX86.select_call_release_gil_mode(self)
- # We have to copy the arguments around a bit more in this mode,
- # but on the other hand we don't need prepare_arguments() moving
- # them in precisely the final registers. Here we look around for
- # unused registers that may be more likely usable.
- from rpython.jit.backend.x86.regalloc import X86_64_RegisterManager
- from rpython.jit.backend.x86.regalloc import X86_64_XMMRegisterManager
- self.already_used = {}
- for loc in self.arglocs:
- self.already_used[loc] = None
- #
- lst = X86_64_RegisterManager.save_around_call_regs[:]
- self._permute_to_prefer_unused_registers(lst)
- # <optimization>
- extra = []
- for reg in self.asm._regalloc.rm.free_regs:
- if (reg not in self.already_used and
- reg in self._ALL_CALLEE_SAVE_GPR):
- extra.append(reg)
- self.free_callee_save_gprs = extra
- lst = extra + lst
- # </optimization>
- self.ARGUMENTS_GPR = lst[:len(self.ARGUMENTS_GPR)]
- self.DONT_MOVE_GPR = self._ALL_CALLEE_SAVE_GPR
- #
- lst = X86_64_XMMRegisterManager.save_around_call_regs[:]
- self._permute_to_prefer_unused_registers(lst)
- self.ARGUMENTS_XMM = lst[:len(self.ARGUMENTS_XMM)]
-
def prepare_arguments(self):
src_locs = []
dst_locs = []
@@ -444,78 +422,44 @@
assert 0 # should not occur on 64-bit
def load_result(self):
- if self.restype == 'S' and self.tmpresloc is None:
+ if self.restype == 'S':
# singlefloat return: use MOVD to load the target register
# from the lower 32 bits of XMM0
self.mc.MOVD32(self.resloc, xmm0)
else:
CallBuilderX86.load_result(self)
- def save_result_value(self):
+ def save_result_value_reacq(self):
# Temporarily save the result value into [ESP].
if self.ressize == 0: # void return
return
#
if self.restype == FLOAT: # and not 'S'
self.mc.MOVSD_sx(0, xmm0.value)
- self.tmpresloc = RawEspLoc(0, FLOAT)
return
#
- if len(self.free_callee_save_gprs) == 0:
- self.tmpresloc = RawEspLoc(0, INT)
- else:
- self.tmpresloc = self.free_callee_save_gprs[0]
- #
if self.restype == 'S':
# singlefloat return: use MOVD to store the lower 32 bits
- # of XMM0 into the tmpresloc (register or [ESP])
- self.mc.MOVD32(self.tmpresloc, xmm0)
+ # of XMM0 into [ESP]
+ self.mc.MOVD32_sx(0, xmm0.value)
else:
assert self.restype == INT
- self.mc.MOV(self.tmpresloc, eax)
+ self.mc.MOV_sr(0, eax.value)
- def save_register_arguments(self):
- # Save the argument registers, which are given by self.ARGUMENTS_xxx.
- n_gpr = min(self.next_arg_gpr, len(self.ARGUMENTS_GPR))
- n_xmm = min(self.next_arg_xmm, len(self.ARGUMENTS_XMM))
- n_saved_regs = n_gpr + n_xmm
- for i in range(n_gpr):
- if self.ARGUMENTS_GPR[i] in self._ALL_CALLEE_SAVE_GPR:
- n_saved_regs -= 1 # don't need to save it
- self.subtract_esp_aligned(n_saved_regs)
+ def restore_result_value_reacq(self):
+ # Opposite of save_result_value_reacq()
+ if self.ressize == 0: # void return
+ return
#
- n = 0
- for i in range(n_gpr):
- if self.ARGUMENTS_GPR[i] not in self._ALL_CALLEE_SAVE_GPR:
- self.mc.MOV_sr(n * WORD, self.ARGUMENTS_GPR[i].value)
- n += 1
- for i in range(n_xmm):
- self.mc.MOVSD_sx(n * WORD, self.ARGUMENTS_XMM[i].value)
- n += 1
- assert n == n_saved_regs
- self.n_saved_regs = n_saved_regs
-
- def restore_register_arguments(self):
- # Restore the saved values into the *real* registers used for calls
- # --- which are not self.ARGUMENTS_xxx!
- n_gpr = min(self.next_arg_gpr, len(self.ARGUMENTS_GPR))
- n_xmm = min(self.next_arg_xmm, len(self.ARGUMENTS_XMM))
+ if self.restype == FLOAT: # and not 'S'
+ self.mc.MOVSD_xs(xmm0.value, 0)
+ return
#
- n = 0
- for i in range(n_gpr):
- tgtvalue = CallBuilder64.ARGUMENTS_GPR[i].value
- if self.ARGUMENTS_GPR[i] not in self._ALL_CALLEE_SAVE_GPR:
- self.mc.MOV_rs(tgtvalue, n * WORD)
- n += 1
- else:
- self.mc.MOV_rr(tgtvalue, self.ARGUMENTS_GPR[i].value)
- for i in range(n_xmm):
- self.mc.MOVSD_xs(CallBuilder64.ARGUMENTS_XMM[i].value, n * WORD)
- n += 1
- assert n == self.n_saved_regs
- #
- if isinstance(self.fnloc, RegLoc): # fix this register
- self.fnloc = CallBuilder64.ARGUMENTS_GPR[n_gpr - 1]
+ if self.restype == 'S':
+ self.mc.MOVD32_xs(xmm0.value, 0)
+ else:
+ assert self.restype == INT
+ self.mc.MOV_rs(eax.value, 0)
if IS_X86_32:
diff --git a/rpython/jit/backend/x86/rx86.py b/rpython/jit/backend/x86/rx86.py
--- a/rpython/jit/backend/x86/rx86.py
+++ b/rpython/jit/backend/x86/rx86.py
@@ -561,7 +561,7 @@
# XXX: Only here for testing purposes..."as" happens the encode the
# registers in the opposite order that we would otherwise do in a
# register-register exchange.
- #XCHG_rr = insn(rex_w, '\x87', register(1), register(2,8), '\xC0')
+ XCHG_rr = insn(rex_w, '\x87', register(1), register(2,8), '\xC0')
JMP_l = insn('\xE9', relative(1))
JMP_r = insn(rex_nw, '\xFF', orbyte(4<<3), register(1), '\xC0')
@@ -589,6 +589,8 @@
FSTPL_b = insn('\xDD', orbyte(3<<3), stack_bp(1)) # rffi.DOUBLE ('as' wants L??)
FSTPL_s = insn('\xDD', orbyte(3<<3), stack_sp(1)) # rffi.DOUBLE ('as' wants L??)
FSTPS_s = insn('\xD9', orbyte(3<<3), stack_sp(1)) # lltype.SingleFloat
+ FLDL_s = insn('\xDD', orbyte(0<<3), stack_sp(1))
+ FLDS_s = insn('\xD9', orbyte(0<<3), stack_sp(1))
# ------------------------------ Random mess -----------------------
RDTSC = insn('\x0F\x31')
@@ -626,8 +628,10 @@
MOVDQ_xb = xmminsn('\x66', rex_w, '\x0F\x6E', register(1, 8), stack_bp(2))
MOVD32_rx = xmminsn('\x66', rex_nw, '\x0F\x7E', register(2, 8), register(1), '\xC0')
+ MOVD32_sx = xmminsn('\x66', rex_nw, '\x0F\x7E', register(2, 8), stack_sp(1))
MOVD32_xr = xmminsn('\x66', rex_nw, '\x0F\x6E', register(1, 8), register(2), '\xC0')
MOVD32_xb = xmminsn('\x66', rex_nw, '\x0F\x6E', register(1, 8), stack_bp(2))
+ MOVD32_xs = xmminsn('\x66', rex_nw, '\x0F\x6E', register(1, 8), stack_sp(2))
PSRAD_xi = xmminsn('\x66', rex_nw, '\x0F\x72', register(1), '\xE0', immediate(2, 'b'))
@@ -751,7 +755,7 @@
define_modrm_modes('SQRTSD_x*', ['\xF2', rex_nw, '\x0F\x51', register(1,8)], regtype='XMM')
-#define_modrm_modes('XCHG_r*', [rex_w, '\x87', register(1, 8)])
+define_modrm_modes('XCHG_r*', [rex_w, '\x87', register(1, 8)])
define_modrm_modes('ADDSD_x*', ['\xF2', rex_nw, '\x0F\x58', register(1, 8)], regtype='XMM')
define_modrm_modes('ADDPD_x*', ['\x66', rex_nw, '\x0F\x58', register(1, 8)], regtype='XMM')
diff --git a/rpython/jit/backend/x86/test/test_callbuilder.py b/rpython/jit/backend/x86/test/test_callbuilder.py
--- a/rpython/jit/backend/x86/test/test_callbuilder.py
+++ b/rpython/jit/backend/x86/test/test_callbuilder.py
@@ -18,16 +18,14 @@
self._log.append(('mov', src, dst))
-def test_base_case():
+def test_base_case(call_release_gil_mode=False):
asm = FakeAssembler()
cb = callbuilder.CallBuilder64(asm, ImmedLoc(12345), [ebx, ebx])
+ if call_release_gil_mode:
+ cb.select_call_release_gil_mode()
cb.prepare_arguments()
assert asm._log == [('mov', ebx, edi),
('mov', ebx, esi)]
-def test_bug_call_release_gil():
- asm = FakeAssembler()
- cb = callbuilder.CallBuilder64(asm, ImmedLoc(12345), [ebx, ebx])
- cb.select_call_release_gil_mode()
- cb.prepare_arguments()
- assert asm._log == [('mov', ebx, ecx)]
+def test_call_release_gil():
+ test_base_case(call_release_gil_mode=True)
diff --git a/rpython/jit/backend/x86/test/test_rx86_32_auto_encoding.py b/rpython/jit/backend/x86/test/test_rx86_32_auto_encoding.py
--- a/rpython/jit/backend/x86/test/test_rx86_32_auto_encoding.py
+++ b/rpython/jit/backend/x86/test/test_rx86_32_auto_encoding.py
@@ -194,7 +194,8 @@
for args in args_lists:
suffix = ""
if (argmodes and not self.is_xmm_insn
- and not instrname.startswith('FSTP')):
+ and not instrname.startswith('FSTP')
+ and not instrname.startswith('FLD')):
suffix = suffixes[self.WORD]
# Special case: On 64-bit CPUs, rx86 assumes 64-bit integer
# operands when converting to/from floating point, so we need to
diff --git a/rpython/memory/gctransform/asmgcroot.py b/rpython/memory/gctransform/asmgcroot.py
--- a/rpython/memory/gctransform/asmgcroot.py
+++ b/rpython/memory/gctransform/asmgcroot.py
@@ -2,6 +2,7 @@
copygraph, SpaceOperation, checkgraph)
from rpython.rlib.debug import ll_assert
from rpython.rlib.nonconst import NonConstant
+from rpython.rlib import rgil
from rpython.rtyper.annlowlevel import llhelper
from rpython.rtyper.lltypesystem import lltype, llmemory, rffi
from rpython.rtyper.lltypesystem.lloperation import llop
@@ -356,16 +357,19 @@
initialframedata = anchor.address[1]
stackscount = 0
while initialframedata != anchor: # while we have not looped back
- self.fill_initial_frame(curframe, initialframedata)
- # Loop over all the frames in the stack
- while self.walk_to_parent_frame(curframe, otherframe):
- swap = curframe
- curframe = otherframe # caller becomes callee
- otherframe = swap
+ self.walk_frames(curframe, otherframe, initialframedata)
# Then proceed to the next piece of stack
initialframedata = initialframedata.address[1]
stackscount += 1
#
+ # for the JIT: rpy_fastgil may contain an extra framedata
+ rpy_fastgil = rgil.gil_fetch_fastgil().signed[0]
+ if rpy_fastgil != 1:
+ ll_assert(rpy_fastgil != 0, "walk_stack_from doesn't have the GIL")
+ initialframedata = rffi.cast(llmemory.Address, rpy_fastgil)
+ self.walk_frames(curframe, otherframe, initialframedata)
+ stackscount += 1
+ #
expected = rffi.stackcounter.stacks_counter
if NonConstant(0):
rffi.stackcounter.stacks_counter += 42 # hack to force it
@@ -374,6 +378,14 @@
lltype.free(otherframe, flavor='raw')
lltype.free(curframe, flavor='raw')
+ def walk_frames(self, curframe, otherframe, initialframedata):
+ self.fill_initial_frame(curframe, initialframedata)
+ # Loop over all the frames in the stack
+ while self.walk_to_parent_frame(curframe, otherframe):
+ swap = curframe
+ curframe = otherframe # caller becomes callee
+ otherframe = swap
+
def fill_initial_frame(self, curframe, initialframedata):
# Read the information provided by initialframedata
initialframedata += 2*sizeofaddr #skip the prev/next words at the start
@@ -770,7 +782,7 @@
gcrootanchor.next = gcrootanchor
c_gcrootanchor = Constant(gcrootanchor, ASM_FRAMEDATA_HEAD_PTR)
-eci = ExternalCompilationInfo(pre_include_bits=['#define PYPY_USE_ASMGCC'])
+eci = ExternalCompilationInfo(compile_extra=['-DPYPY_USE_ASMGCC'])
pypy_asm_stackwalk = rffi.llexternal('pypy_asm_stackwalk',
[ASM_CALLBACK_PTR,
diff --git a/rpython/rlib/rgil.py b/rpython/rlib/rgil.py
new file mode 100644
--- /dev/null
+++ b/rpython/rlib/rgil.py
@@ -0,0 +1,38 @@
+import py
+from rpython.conftest import cdir
+from rpython.translator.tool.cbuild import ExternalCompilationInfo
+from rpython.rtyper.lltypesystem import lltype, llmemory, rffi
+
+# these functions manipulate directly the GIL, whose definition does not
+# escape the C code itself
+translator_c_dir = py.path.local(cdir)
+
+eci = ExternalCompilationInfo(
+ includes = ['src/thread.h'],
+ separate_module_files = [translator_c_dir / 'src' / 'thread.c'],
+ include_dirs = [translator_c_dir],
+ export_symbols = ['RPyGilAllocate', 'RPyGilYieldThread', 'RPyGilRelease',
+ 'RPyGilAcquire', 'RPyFetchFastGil'])
+
+llexternal = rffi.llexternal
+
+
+gil_allocate = llexternal('RPyGilAllocate', [], lltype.Void,
+ _nowrapper=True, sandboxsafe=True,
+ compilation_info=eci)
+
+gil_yield_thread = llexternal('RPyGilYieldThread', [], lltype.Signed,
+ _nowrapper=True, sandboxsafe=True,
+ compilation_info=eci)
+
+gil_release = llexternal('RPyGilRelease', [], lltype.Void,
+ _nowrapper=True, sandboxsafe=True,
+ compilation_info=eci)
+
+gil_acquire = llexternal('RPyGilAcquire', [], lltype.Void,
+ _nowrapper=True, sandboxsafe=True,
+ compilation_info=eci)
+
+gil_fetch_fastgil = llexternal('RPyFetchFastGil', [], llmemory.Address,
+ _nowrapper=True, sandboxsafe=True,
+ compilation_info=eci)
diff --git a/rpython/rlib/rthread.py b/rpython/rlib/rthread.py
--- a/rpython/rlib/rthread.py
+++ b/rpython/rlib/rthread.py
@@ -19,8 +19,7 @@
include_dirs = [translator_c_dir],
export_symbols = ['RPyThreadGetIdent', 'RPyThreadLockInit',
'RPyThreadAcquireLock', 'RPyThreadAcquireLockTimed',
- 'RPyThreadReleaseLock', 'RPyGilAllocate',
- 'RPyGilYieldThread', 'RPyGilRelease', 'RPyGilAcquire',
+ 'RPyThreadReleaseLock',
'RPyThreadGetStackSize', 'RPyThreadSetStackSize',
'RPyOpaqueDealloc_ThreadLock',
'RPyThreadAfterFork']
@@ -76,16 +75,6 @@
[TLOCKP], lltype.Void,
_nowrapper=True)
-# these functions manipulate directly the GIL, whose definition does not
-# escape the C code itself
-gil_allocate = llexternal('RPyGilAllocate', [], lltype.Signed,
- _nowrapper=True)
-gil_yield_thread = llexternal('RPyGilYieldThread', [], lltype.Signed,
- _nowrapper=True)
-gil_release = llexternal('RPyGilRelease', [], lltype.Void,
- _nowrapper=True)
-gil_acquire = llexternal('RPyGilAcquire', [], lltype.Void,
- _nowrapper=True)
def allocate_lock():
return Lock(allocate_ll_lock())
diff --git a/rpython/translator/c/gcc/trackgcroot.py b/rpython/translator/c/gcc/trackgcroot.py
--- a/rpython/translator/c/gcc/trackgcroot.py
+++ b/rpython/translator/c/gcc/trackgcroot.py
@@ -858,13 +858,17 @@
return []
def _visit_xchg(self, line):
- # only support the format used in VALGRIND_DISCARD_TRANSLATIONS
+ # support the format used in VALGRIND_DISCARD_TRANSLATIONS
# which is to use a marker no-op "xchgl %ebx, %ebx"
match = self.r_binaryinsn.match(line)
source = match.group("source")
target = match.group("target")
if source == target:
return []
+ # ignore the 'rpy_fastgil' atomic exchange, or any locked
+ # atomic exchange at all (involving memory)
+ if not source.startswith('%'):
+ return []
raise UnrecognizedOperation(line)
def visit_call(self, line):
diff --git a/rpython/translator/c/src/mem.c b/rpython/translator/c/src/mem.c
--- a/rpython/translator/c/src/mem.c
+++ b/rpython/translator/c/src/mem.c
@@ -115,6 +115,11 @@
got += 1;
fd = ((void* *) (((char *)fd) + sizeof(void*)))[0];
}
+ if (rpy_fastgil != 1) {
+ RPyAssert(rpy_fastgil != 0,
+ "pypy_check_stack_count doesn't have the GIL");
+ got++; /* <= the extra one currently stored in rpy_fastgil */
+ }
RPyAssert(got == stacks_counter - 1,
"bad stacks_counter or non-closed stacks around");
# endif
diff --git a/rpython/translator/c/src/thread.c b/rpython/translator/c/src/thread.c
--- a/rpython/translator/c/src/thread.c
+++ b/rpython/translator/c/src/thread.c
@@ -9,9 +9,14 @@
#include "common_header.h"
#endif
+#ifdef PYPY_USE_ASMGCC
+# include "common_header.h"
+# include "structdef.h"
+# include "forwarddecl.h"
+#endif
+
#ifdef _WIN32
#include "src/thread_nt.c"
#else
#include "src/thread_pthread.c"
#endif
-
diff --git a/rpython/translator/c/src/thread.h b/rpython/translator/c/src/thread.h
--- a/rpython/translator/c/src/thread.h
+++ b/rpython/translator/c/src/thread.h
@@ -24,9 +24,26 @@
#endif /* !_WIN32 */
-long RPyGilAllocate(void);
+void RPyGilAllocate(void);
long RPyGilYieldThread(void);
-void RPyGilRelease(void);
void RPyGilAcquire(void);
+#define RPyGilRelease _RPyGilRelease
+#define RPyFetchFastGil _RPyFetchFastGil
+
+#ifdef PYPY_USE_ASMGCC
+# define RPY_FASTGIL_LOCKED(x) (x == 1)
+#else
+# define RPY_FASTGIL_LOCKED(x) (x != 0)
+#endif
+
+extern long rpy_fastgil;
+
+static inline void _RPyGilRelease(void) {
+ assert(RPY_FASTGIL_LOCKED(rpy_fastgil));
+ rpy_fastgil = 0;
+}
+static inline long *_RPyFetchFastGil(void) {
+ return &rpy_fastgil;
+}
#endif
diff --git a/rpython/translator/c/src/thread_gil.c b/rpython/translator/c/src/thread_gil.c
new file mode 100644
--- /dev/null
+++ b/rpython/translator/c/src/thread_gil.c
@@ -0,0 +1,177 @@
+
+/* Idea:
+
+ - "The GIL" is a composite concept. There are two locks, and "the
+ GIL is locked" when both are locked.
+
+ - The first lock is a simple global variable 'rpy_fastgil'. With
+ shadowstack, we use the most portable definition: 0 means unlocked
+ and != 0 means locked. With asmgcc, 0 means unlocked but only 1
+ means locked. A different value means unlocked too, but the value
+ is used by the JIT to contain the stack top for stack root scanning.
+
+ - The second lock is a regular mutex. In the fast path, it is never
+ unlocked. Remember that "the GIL is unlocked" means that either
+ the first or the second lock is unlocked. It should never be the
+ case that both are unlocked at the same time.
+
+ - Let's call "thread 1" the thread with the GIL. Whenever it does an
+ external function call, it sets 'rpy_fastgil' to 0 (unlocked).
+ This is the cheapest way to release the GIL. When it returns from
+ the function call, this thread attempts to atomically change
+ 'rpy_fastgil' to 1. In the common case where it works, thread 1
+ has got the GIL back and so continues to run.
+
+ - Say "thread 2" is eagerly waiting for thread 1 to become blocked in
+ some long-running call. Regularly, it checks if 'rpy_fastgil' is 0
+ and tries to atomically change it to 1. If it succeeds, it means
+ that the GIL was not previously locked. Thread 2 has now got the GIL.
+
+ - If there are more than 2 threads, the rest is really sleeping by
+ waiting on the 'mutex_gil_stealer' held by thread 2.
+
+ - An additional mechanism is used for when thread 1 wants to
+ explicitly yield the GIL to thread 2: it does so by releasing
+ 'mutex_gil' (which is otherwise not released) but keeping the
+ value of 'rpy_fastgil' to 1.
+*/
+
+long rpy_fastgil = 1;
+long rpy_waiting_threads = -42; /* GIL not initialized */
+static mutex_t mutex_gil_stealer;
+static mutex_t mutex_gil;
+
+void RPyGilAllocate(void)
+{
+ assert(RPY_FASTGIL_LOCKED(rpy_fastgil));
+ mutex_init(&mutex_gil_stealer);
+ mutex_init(&mutex_gil);
+ mutex_lock(&mutex_gil);
+ rpy_waiting_threads = 0;
+}
+
+void RPyGilAcquire(void)
+{
+ /* Acquires the GIL.
+
+ XXX Note: this function saves and restores 'errno'. This is
+ needed for now because it may be *followed* by reading the
+ 'errno', although it's kind of bogus: it should be read before
+ calling RPyGilAcquire().
+ */
+ long old_fastgil = lock_test_and_set(&rpy_fastgil, 1);
+
+ if (!RPY_FASTGIL_LOCKED(old_fastgil)) {
+ /* The fastgil was not previously locked: success.
+ 'mutex_gil' should still be locked at this point.
+ */
+ }
+ else {
+ /* Otherwise, another thread is busy with the GIL. */
+ SAVE_ERRNO();
+
+ /* Register me as one of the threads that is actively waiting
+ for the GIL. The number of such threads is found in
+ rpy_waiting_threads. */
+ assert(rpy_waiting_threads >= 0);
+ atomic_increment(&rpy_waiting_threads);
+
+ /* Enter the waiting queue from the end. Assuming a roughly
+ first-in-first-out order, this will nicely give the threads
+ a round-robin chance.
+ */
+ mutex_lock(&mutex_gil_stealer);
+
+ /* We are now the stealer thread. Steals! */
+ while (1) {
+ /* Sleep for one interval of time. We may be woken up earlier
+ if 'mutex_gil' is released.
+ */
+ if (mutex_lock_timeout(&mutex_gil, 0.0001)) { /* 0.1 ms... */
+ /* We arrive here if 'mutex_gil' was recently released
+ and we just relocked it.
+ */
+ old_fastgil = 0;
+ break;
+ }
+
+ /* Busy-looping here. Try to look again if 'rpy_fastgil' is
+ released.
+ */
+ if (!RPY_FASTGIL_LOCKED(rpy_fastgil)) {
+ old_fastgil = lock_test_and_set(&rpy_fastgil, 1);
+ if (!RPY_FASTGIL_LOCKED(old_fastgil))
+ /* yes, got a non-held value! Now we hold it. */
+ break;
+ }
+ /* Otherwise, loop back. */
+ }
+ atomic_decrement(&rpy_waiting_threads);
+ mutex_unlock(&mutex_gil_stealer);
+
+ RESTORE_ERRNO();
+ }
+ assert(RPY_FASTGIL_LOCKED(rpy_fastgil));
+
+#ifdef PYPY_USE_ASMGCC
+ if (old_fastgil != 0) {
+ /* this case only occurs from the JIT compiler */
+ struct pypy_ASM_FRAMEDATA_HEAD0 *new =
+ (struct pypy_ASM_FRAMEDATA_HEAD0 *)old_fastgil;
+ struct pypy_ASM_FRAMEDATA_HEAD0 *root = &pypy_g_ASM_FRAMEDATA_HEAD;
+ struct pypy_ASM_FRAMEDATA_HEAD0 *next = root->as_next;
+ new->as_next = next;
+ new->as_prev = root;
+ root->as_next = new;
+ next->as_prev = new;
+ }
+#else
+ assert(old_fastgil == 0);
+#endif
+}
+
+long RPyGilYieldThread(void)
+{
+ /* can be called even before RPyGilAllocate(), but in this case,
+ 'rpy_waiting_threads' will be -42. */
+ assert(RPY_FASTGIL_LOCKED(rpy_fastgil));
+ if (rpy_waiting_threads <= 0)
+ return 0;
+
+ /* Explicitly release the 'mutex_gil'.
+ */
+ mutex_unlock(&mutex_gil);
+
+ /* Now nobody has got the GIL, because 'mutex_gil' is released (but
+ rpy_fastgil is still locked). Call RPyGilAcquire(). It will
+ enqueue ourselves at the end of the 'mutex_gil_stealer' queue.
+ If there is no other waiting thread, it will fall through both
+ its mutex_lock() and mutex_lock_timeout() now. But that's
+ unlikely, because we tested above that 'rpy_waiting_threads > 0'.
+ */
+ RPyGilAcquire();
+ return 1;
+}
+
+/********** for tests only **********/
+
+/* These functions are usually defined as a macros RPyXyz() in thread.h
+ which get translated into calls to _RpyXyz(). But for tests we need
+ the real functions to exists in the library as well.
+*/
+
+#undef RPyGilRelease
+void RPyGilRelease(void)
+{
+ /* Releases the GIL in order to do an external function call.
+ We assume that the common case is that the function call is
+ actually very short, and optimize accordingly.
+ */
+ _RPyGilRelease();
+}
+
+#undef RPyFetchFastGil
+long *RPyFetchFastGil(void)
+{
+ return _RPyFetchFastGil();
+}
diff --git a/rpython/translator/c/src/thread_nt.c b/rpython/translator/c/src/thread_nt.c
--- a/rpython/translator/c/src/thread_nt.c
+++ b/rpython/translator/c/src/thread_nt.c
@@ -196,50 +196,40 @@
/* GIL code */
/************************************************************/
-static volatile LONG pending_acquires = -1;
-static CRITICAL_SECTION mutex_gil;
-static HANDLE cond_gil;
+typedef HANDLE mutex_t; /* a semaphore, on Windows */
-long RPyGilAllocate(void)
-{
- pending_acquires = 0;
- InitializeCriticalSection(&mutex_gil);
- EnterCriticalSection(&mutex_gil);
- cond_gil = CreateEvent (NULL, FALSE, FALSE, NULL);
- return 1;
+static void gil_fatal(const char *msg) {
+ fprintf(stderr, "Fatal error in the GIL: %s\n", msg);
+ abort();
}
-long RPyGilYieldThread(void)
-{
- /* can be called even before RPyGilAllocate(), but in this case,
- pending_acquires will be -1 */
- if (pending_acquires <= 0)
- return 0;
- InterlockedIncrement(&pending_acquires);
- PulseEvent(cond_gil);
-
- /* hack: the three following lines do a pthread_cond_wait(), and
- normally specifying a timeout of INFINITE would be fine. But the
- first and second operations are not done atomically, so there is a
- (small) risk that PulseEvent misses the WaitForSingleObject().
- In this case the process will just sleep a few milliseconds. */
- LeaveCriticalSection(&mutex_gil);
- WaitForSingleObject(cond_gil, 15);
- EnterCriticalSection(&mutex_gil);
-
- InterlockedDecrement(&pending_acquires);
- return 1;
+static inline void mutex_init(mutex_t *mutex) {
+ *mutex = CreateSemaphore(NULL, 1, 1, NULL);
+ if (*mutex == NULL)
+ gil_fatal("CreateSemaphore failed");
}
-void RPyGilRelease(void)
-{
- LeaveCriticalSection(&mutex_gil);
- PulseEvent(cond_gil);
+static inline void mutex_lock(mutex_t *mutex) {
+ WaitForSingleObject(*mutex, INFINITE);
}
-void RPyGilAcquire(void)
+static inline void mutex_unlock(mutex_t *mutex) {
+ ReleaseSemaphore(*mutex, 1, NULL);
+}
+
+static inline int mutex_lock_timeout(mutex_t *mutex, double delay)
{
- InterlockedIncrement(&pending_acquires);
- EnterCriticalSection(&mutex_gil);
- InterlockedDecrement(&pending_acquires);
+ DWORD result = WaitForSingleObject(*mutex, (DWORD)(delay * 1000.0 + 0.999));
+ return (result != WAIT_TIMEOUT);
}
+
+#define lock_test_and_set(ptr, value) InterlockedExchangeAcquire(ptr, value)
+#define atomic_increment(ptr) InterlockedIncrement(ptr)
+#define atomic_decrement(ptr) InterlockedDecrement(ptr)
+
+#define SAVE_ERRNO() int saved_errno = errno; \
+ DWORD saved_lasterr = GetLastError()
+#define RESTORE_ERRNO() errno = saved_errno; \
+ SetLastError(saved_lasterr)
+
+#include "src/thread_gil.c"
diff --git a/rpython/translator/c/src/thread_pthread.c b/rpython/translator/c/src/thread_pthread.c
--- a/rpython/translator/c/src/thread_pthread.c
+++ b/rpython/translator/c/src/thread_pthread.c
@@ -472,29 +472,7 @@
/* GIL code */
/************************************************************/
-#ifdef __llvm__
-# define HAS_ATOMIC_ADD
-#endif
-
-#ifdef __GNUC__
-# if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
-# define HAS_ATOMIC_ADD
-# endif
-#endif
-
-#ifdef HAS_ATOMIC_ADD
-# define atomic_add __sync_fetch_and_add
-#else
-# if defined(__amd64__)
-# define atomic_add(ptr, value) asm volatile ("lock addq %0, %1" \
- : : "ri"(value), "m"(*(ptr)) : "memory")
-# elif defined(__i386__)
-# define atomic_add(ptr, value) asm volatile ("lock addl %0, %1" \
- : : "ri"(value), "m"(*(ptr)) : "memory")
-# else
-# error "Please use gcc >= 4.1 or write a custom 'asm' for your CPU."
-# endif
-#endif
+#include <time.h>
#define ASSERT_STATUS(call) \
if (call != 0) { \
@@ -502,88 +480,44 @@
abort(); \
}
-static void _debug_print(const char *msg)
+static inline void timespec_add(struct timespec *t, double incr)
{
-#if 0
- int col = (int)pthread_self();
- col = 31 + ((col / 8) % 8);
- fprintf(stderr, "\033[%dm%s\033[0m", col, msg);
-#endif
+ /* assumes that "incr" is not too large, less than 1 second */
+ long nsec = t->tv_nsec + (long)(incr * 1000000000.0);
+ if (nsec >= 1000000000) {
+ t->tv_sec += 1;
+ nsec -= 1000000000;
+ assert(nsec < 1000000000);
+ }
+ t->tv_nsec = nsec;
}
-static volatile long pending_acquires = -1;
-static pthread_mutex_t mutex_gil;
-static pthread_cond_t cond_gil;
+typedef pthread_mutex_t mutex_t;
-static void assert_has_the_gil(void)
-{
-#ifdef RPY_ASSERT
- assert(pthread_mutex_trylock(&mutex_gil) != 0);
- assert(pending_acquires >= 0);
-#endif
+static inline void mutex_init(mutex_t *mutex) {
+ ASSERT_STATUS(pthread_mutex_init(mutex, pthread_mutexattr_default));
}
-
-long RPyGilAllocate(void)
-{
- int status, error = 0;
- _debug_print("RPyGilAllocate\n");
- pending_acquires = -1;
-
- status = pthread_mutex_init(&mutex_gil,
- pthread_mutexattr_default);
- CHECK_STATUS("pthread_mutex_init[GIL]");
-
- status = pthread_cond_init(&cond_gil,
- pthread_condattr_default);
- CHECK_STATUS("pthread_cond_init[GIL]");
-
- if (error == 0) {
- pending_acquires = 0;
- RPyGilAcquire();
- }
- return (error == 0);
+static inline void mutex_lock(mutex_t *mutex) {
+ ASSERT_STATUS(pthread_mutex_lock(mutex));
}
-
-long RPyGilYieldThread(void)
-{
- /* can be called even before RPyGilAllocate(), but in this case,
- pending_acquires will be -1 */
-#ifdef RPY_ASSERT
- if (pending_acquires >= 0)
- assert_has_the_gil();
-#endif
- if (pending_acquires <= 0)
+static inline void mutex_unlock(mutex_t *mutex) {
+ ASSERT_STATUS(pthread_mutex_unlock(mutex));
+}
+static inline int mutex_lock_timeout(mutex_t *mutex, double delay) {
+ struct timespec t;
+ clock_gettime(CLOCK_REALTIME, &t);
+ timespec_add(&t, delay);
+ int error_from_timedlock = pthread_mutex_timedlock(mutex, &t);
+ if (error_from_timedlock == ETIMEDOUT)
return 0;
- atomic_add(&pending_acquires, 1L);
- _debug_print("{");
- ASSERT_STATUS(pthread_cond_signal(&cond_gil));
- ASSERT_STATUS(pthread_cond_wait(&cond_gil, &mutex_gil));
- _debug_print("}");
- atomic_add(&pending_acquires, -1L);
- assert_has_the_gil();
+ ASSERT_STATUS(error_from_timedlock);
return 1;
}
+#define lock_test_and_set(ptr, value) __sync_lock_test_and_set(ptr, value)
+#define atomic_increment(ptr) __sync_fetch_and_add(ptr, 1)
+#define atomic_decrement(ptr) __sync_fetch_and_sub(ptr, 1)
-void RPyGilRelease(void)
-{
- _debug_print("RPyGilRelease\n");
-#ifdef RPY_ASSERT
- assert(pending_acquires >= 0);
-#endif
- assert_has_the_gil();
- ASSERT_STATUS(pthread_mutex_unlock(&mutex_gil));
- ASSERT_STATUS(pthread_cond_signal(&cond_gil));
-}
+#define SAVE_ERRNO() int saved_errno = errno
+#define RESTORE_ERRNO() errno = saved_errno
-void RPyGilAcquire(void)
-{
- _debug_print("about to RPyGilAcquire...\n");
-#ifdef RPY_ASSERT
- assert(pending_acquires >= 0);
-#endif
- atomic_add(&pending_acquires, 1L);
- ASSERT_STATUS(pthread_mutex_lock(&mutex_gil));
- atomic_add(&pending_acquires, -1L);
- assert_has_the_gil();
- _debug_print("RPyGilAcquire\n");
-}
+#include "src/thread_gil.c"
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