diff options
author | kseitz <kseitz@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-06-21 20:56:37 +0000 |
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committer | kseitz <kseitz@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-06-21 20:56:37 +0000 |
commit | 4026b9778b81cfd22bc8fa18c1e0d3beb32dbc8f (patch) | |
tree | 55fd808e47f53739af4e710b68299196cc64643e /boehm-gc/pthread_stop_world.c | |
parent | 7d3075f603f9e3ec6240cc87ff86d5ff84fc983f (diff) |
* pthread_stop_world.c (GC_suspend_handler): Redirect to suspension
routine if signal is received and thread is flagged SUSPENDED.
(suspend_self): New function.
(GC_suspend_thread): New function.
(GC_resume_thread): New function.
* include/gc.h (GC_suspend_thread): Declare.
(GC_resumet_thread): Declare.
* include/private/pthread_support.h (SUSPENDED): New GC_thread
flag.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@114869 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'boehm-gc/pthread_stop_world.c')
-rw-r--r-- | boehm-gc/pthread_stop_world.c | 65 |
1 files changed, 59 insertions, 6 deletions
diff --git a/boehm-gc/pthread_stop_world.c b/boehm-gc/pthread_stop_world.c index b9034dc7f5b..de647769c7c 100644 --- a/boehm-gc/pthread_stop_world.c +++ b/boehm-gc/pthread_stop_world.c @@ -13,6 +13,8 @@ /* Doesn't exist on HP/UX 11.11. */ #endif +void suspend_self(); + #if DEBUG_THREADS #ifndef NSIG @@ -127,9 +129,14 @@ extern void GC_with_callee_saves_pushed(); void GC_suspend_handler(int sig) { - int old_errno = errno; - GC_with_callee_saves_pushed(GC_suspend_handler_inner, (ptr_t)(word)sig); - errno = old_errno; + GC_thread me = GC_lookup_thread (pthread_self()); + if (me -> flags & SUSPENDED) + suspend_self(); + else { + int old_errno = errno; + GC_with_callee_saves_pushed(GC_suspend_handler_inner, (ptr_t)(word)sig); + errno = old_errno; + } } #else @@ -137,9 +144,14 @@ void GC_suspend_handler(int sig) /* in the signal handler frame. */ void GC_suspend_handler(int sig) { - int old_errno = errno; - GC_suspend_handler_inner((ptr_t)(word)sig); - errno = old_errno; + GC_thread me = GC_lookup_thread(pthread_self()); + if (me -> flags & SUSPENDED) + suspend_self(); + else { + int old_errno = errno; + GC_suspend_handler_inner((ptr_t)(word)sig); + errno = old_errno; + } } #endif @@ -430,6 +442,47 @@ void GC_stop_world() GC_stopping_thread = 0; /* debugging only */ } +void suspend_self() { + GC_thread me = GC_lookup_thread(pthread_self()); + if (me == NULL) + ABORT("attempting to suspend unknown thread"); + + me -> flags |= SUSPENDED; + GC_start_blocking(); + while (me -> flags & SUSPENDED) + GC_brief_async_signal_safe_sleep(); + GC_end_blocking(); +} + +void GC_suspend_thread(pthread_t thread) { + if (thread == pthread_self()) + suspend_self(); + else { + int result; + GC_thread t = GC_lookup_thread(thread); + if (t == NULL) + ABORT("attempting to suspend unknown thread"); + + t -> flags |= SUSPENDED; + result = pthread_kill (t -> id, SIG_SUSPEND); + switch (result) { + case ESRCH: + case 0: + break; + default: + ABORT("pthread_kill failed"); + } + } +} + +void GC_resume_thread(pthread_t thread) { + GC_thread t = GC_lookup_thread(thread); + if (t == NULL) + ABORT("attempting to resume unknown thread"); + + t -> flags &= ~SUSPENDED; +} + /* Caller holds allocation lock, and has held it continuously since */ /* the world stopped. */ void GC_start_world() |