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python3/SOURCES/00370-GIL-monotonic-clock.patch
CentOS Sources 428a34aada import python3-3.6.8-45.el8
2022-03-30 15:56:15 +00:00

268 lines
8.9 KiB
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diff --git a/Makefile.pre.in b/Makefile.pre.in
index 8da1965..9864fe2 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -884,7 +884,8 @@ regen-opcode-targets:
$(srcdir)/Python/opcode_targets.h.new
$(UPDATE_FILE) $(srcdir)/Python/opcode_targets.h $(srcdir)/Python/opcode_targets.h.new
-Python/ceval.o: $(srcdir)/Python/opcode_targets.h $(srcdir)/Python/ceval_gil.h
+Python/ceval.o: $(srcdir)/Python/opcode_targets.h $(srcdir)/Python/ceval_gil.h \
+ $(srcdir)/Python/condvar.h
Python/frozen.o: $(srcdir)/Python/importlib.h $(srcdir)/Python/importlib_external.h
@@ -1706,7 +1707,7 @@ patchcheck: @DEF_MAKE_RULE@
# Dependencies
-Python/thread.o: @THREADHEADERS@
+Python/thread.o: @THREADHEADERS@ $(srcdir)/Python/condvar.h
# Declare targets that aren't real files
.PHONY: all build_all sharedmods check-clean-src oldsharedmods test quicktest
diff --git a/Python/ceval.c b/Python/ceval.c
index 0b30cc1..3f1300c 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -232,6 +232,7 @@ PyEval_InitThreads(void)
{
if (gil_created())
return;
+ PyThread_init_thread();
create_gil();
take_gil(PyThreadState_GET());
main_thread = PyThread_get_thread_ident();
diff --git a/Python/condvar.h b/Python/condvar.h
index 9a71b17..39a420f 100644
--- a/Python/condvar.h
+++ b/Python/condvar.h
@@ -59,20 +59,6 @@
#include <pthread.h>
-#define PyCOND_ADD_MICROSECONDS(tv, interval) \
-do { /* TODO: add overflow and truncation checks */ \
- tv.tv_usec += (long) interval; \
- tv.tv_sec += tv.tv_usec / 1000000; \
- tv.tv_usec %= 1000000; \
-} while (0)
-
-/* We assume all modern POSIX systems have gettimeofday() */
-#ifdef GETTIMEOFDAY_NO_TZ
-#define PyCOND_GETTIMEOFDAY(ptv) gettimeofday(ptv)
-#else
-#define PyCOND_GETTIMEOFDAY(ptv) gettimeofday(ptv, (struct timezone *)NULL)
-#endif
-
/* The following functions return 0 on success, nonzero on error */
#define PyMUTEX_T pthread_mutex_t
#define PyMUTEX_INIT(mut) pthread_mutex_init((mut), NULL)
@@ -81,32 +67,30 @@ do { /* TODO: add overflow and truncation checks */ \
#define PyMUTEX_UNLOCK(mut) pthread_mutex_unlock(mut)
#define PyCOND_T pthread_cond_t
-#define PyCOND_INIT(cond) pthread_cond_init((cond), NULL)
+#define PyCOND_INIT(cond) _PyThread_cond_init(cond)
#define PyCOND_FINI(cond) pthread_cond_destroy(cond)
#define PyCOND_SIGNAL(cond) pthread_cond_signal(cond)
#define PyCOND_BROADCAST(cond) pthread_cond_broadcast(cond)
#define PyCOND_WAIT(cond, mut) pthread_cond_wait((cond), (mut))
+/* These private functions are implemented in Python/thread_pthread.h */
+int _PyThread_cond_init(PyCOND_T *cond);
+void _PyThread_cond_after(long long us, struct timespec *abs);
+
/* return 0 for success, 1 on timeout, -1 on error */
Py_LOCAL_INLINE(int)
PyCOND_TIMEDWAIT(PyCOND_T *cond, PyMUTEX_T *mut, long long us)
{
- int r;
- struct timespec ts;
- struct timeval deadline;
-
- PyCOND_GETTIMEOFDAY(&deadline);
- PyCOND_ADD_MICROSECONDS(deadline, us);
- ts.tv_sec = deadline.tv_sec;
- ts.tv_nsec = deadline.tv_usec * 1000;
-
- r = pthread_cond_timedwait((cond), (mut), &ts);
- if (r == ETIMEDOUT)
+ struct timespec abs;
+ _PyThread_cond_after(us, &abs);
+ int ret = pthread_cond_timedwait(cond, mut, &abs);
+ if (ret == ETIMEDOUT) {
return 1;
- else if (r)
+ }
+ if (ret) {
return -1;
- else
- return 0;
+ }
+ return 0;
}
#elif defined(NT_THREADS)
diff --git a/Python/thread.c b/Python/thread.c
index 63eeb1e..c5d0e59 100644
--- a/Python/thread.c
+++ b/Python/thread.c
@@ -6,6 +6,7 @@
Stuff shared by all thread_*.h files is collected here. */
#include "Python.h"
+#include "condvar.h"
#ifndef _POSIX_THREADS
/* This means pthreads are not implemented in libc headers, hence the macro
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index baea71f..7dc295e 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -66,16 +66,6 @@
#endif
#endif
-#if !defined(pthread_attr_default)
-# define pthread_attr_default ((pthread_attr_t *)NULL)
-#endif
-#if !defined(pthread_mutexattr_default)
-# define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
-#endif
-#if !defined(pthread_condattr_default)
-# define pthread_condattr_default ((pthread_condattr_t *)NULL)
-#endif
-
/* Whether or not to use semaphores directly rather than emulating them with
* mutexes and condition variables:
@@ -120,6 +110,56 @@ do { \
} while(0)
+/*
+ * pthread_cond support
+ */
+
+#if defined(HAVE_PTHREAD_CONDATTR_SETCLOCK) && defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC)
+// monotonic is supported statically. It doesn't mean it works on runtime.
+#define CONDATTR_MONOTONIC
+#endif
+
+// NULL when pthread_condattr_setclock(CLOCK_MONOTONIC) is not supported.
+static pthread_condattr_t *condattr_monotonic = NULL;
+
+static void
+init_condattr()
+{
+#ifdef CONDATTR_MONOTONIC
+ static pthread_condattr_t ca;
+ pthread_condattr_init(&ca);
+ if (pthread_condattr_setclock(&ca, CLOCK_MONOTONIC) == 0) {
+ condattr_monotonic = &ca; // Use monotonic clock
+ }
+#endif
+}
+
+int
+_PyThread_cond_init(PyCOND_T *cond)
+{
+ return pthread_cond_init(cond, condattr_monotonic);
+}
+
+void
+_PyThread_cond_after(long long us, struct timespec *abs)
+{
+#ifdef CONDATTR_MONOTONIC
+ if (condattr_monotonic) {
+ clock_gettime(CLOCK_MONOTONIC, abs);
+ abs->tv_sec += us / 1000000;
+ abs->tv_nsec += (us % 1000000) * 1000;
+ abs->tv_sec += abs->tv_nsec / 1000000000;
+ abs->tv_nsec %= 1000000000;
+ return;
+ }
+#endif
+
+ struct timespec ts;
+ MICROSECONDS_TO_TIMESPEC(us, ts);
+ *abs = ts;
+}
+
+
/* A pthread mutex isn't sufficient to model the Python lock type
* because, according to Draft 5 of the docs (P1003.4a/D5), both of the
* following are undefined:
@@ -175,6 +215,7 @@ PyThread__init_thread(void)
extern void pthread_init(void);
pthread_init();
#endif
+ init_condattr();
}
#endif /* !_HAVE_BSDI */
@@ -449,8 +490,7 @@ PyThread_allocate_lock(void)
memset((void *)lock, '\0', sizeof(pthread_lock));
lock->locked = 0;
- status = pthread_mutex_init(&lock->mut,
- pthread_mutexattr_default);
+ status = pthread_mutex_init(&lock->mut, NULL);
CHECK_STATUS_PTHREAD("pthread_mutex_init");
/* Mark the pthread mutex underlying a Python mutex as
pure happens-before. We can't simply mark the
@@ -459,8 +499,7 @@ PyThread_allocate_lock(void)
will cause errors. */
_Py_ANNOTATE_PURE_HAPPENS_BEFORE_MUTEX(&lock->mut);
- status = pthread_cond_init(&lock->lock_released,
- pthread_condattr_default);
+ status = _PyThread_cond_init(&lock->lock_released);
CHECK_STATUS_PTHREAD("pthread_cond_init");
if (error) {
@@ -519,9 +558,10 @@ PyThread_acquire_lock_timed(PyThread_type_lock lock, PY_TIMEOUT_T microseconds,
success = PY_LOCK_ACQUIRED;
}
else if (microseconds != 0) {
- struct timespec ts;
- if (microseconds > 0)
- MICROSECONDS_TO_TIMESPEC(microseconds, ts);
+ struct timespec abs;
+ if (microseconds > 0) {
+ _PyThread_cond_after(microseconds, &abs);
+ }
/* continue trying until we get the lock */
/* mut must be locked by me -- part of the condition
@@ -530,10 +570,13 @@ PyThread_acquire_lock_timed(PyThread_type_lock lock, PY_TIMEOUT_T microseconds,
if (microseconds > 0) {
status = pthread_cond_timedwait(
&thelock->lock_released,
- &thelock->mut, &ts);
+ &thelock->mut, &abs);
+ if (status == 1) {
+ break;
+ }
if (status == ETIMEDOUT)
break;
- CHECK_STATUS_PTHREAD("pthread_cond_timed_wait");
+ CHECK_STATUS_PTHREAD("pthread_cond_timedwait");
}
else {
status = pthread_cond_wait(
diff --git a/configure.ac b/configure.ac
index a0e3613..8a17559 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3582,7 +3582,7 @@ AC_CHECK_FUNCS(alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
memrchr mbrtowc mkdirat mkfifo \
mkfifoat mknod mknodat mktime mremap nice openat pathconf pause pipe2 plock poll \
posix_fallocate posix_fadvise pread \
- pthread_init pthread_kill putenv pwrite readlink readlinkat readv realpath renameat \
+ pthread_condattr_setclock pthread_init pthread_kill putenv pwrite readlink readlinkat readv realpath renameat \
select sem_open sem_timedwait sem_getvalue sem_unlink sendfile setegid seteuid \
setgid sethostname \
setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setpriority setuid setvbuf \
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