ivmai / bdwgc / 1287
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coverage: 73.715% (+0.04%) from 73.677%
1287

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ivmai 
Fix hang in select() called from suspend signal handler if TSan

Issue #236 (bdwgc).

Previously select() was used to sleep in the suspend signal handler
while the thread is manually suspended.  This is changed to use
sigsuspend() instead.  (But select() is still used for a reason when
the thread is self-suspended.)

* pthread_stop_world.c [!GC_OPENBSD_UTHREADS && !NACL] (GC_stop_count):
Update comment.
* pthread_stop_world.c [!GC_OPENBSD_UTHREADS && !NACL
&& GC_ENABLE_SUSPEND_THREAD] (GC_suspend_handler_inner): Remove
calls of GC_store_stack_ptr(), sem_post(), GC_suspend_self_inner(),
RESTORE_CANCEL() (dedicated to manual thread suspend).
* pthread_stop_world.c [!GC_OPENBSD_UTHREADS && !NACL
&& GC_ENABLE_SUSPEND_THREAD && E2K] (GC_suspend_handler_inner): Remove
backing_store_end and backing_store_ptr set and clear dedicated to
manual thread suspend.
* pthread_stop_world.c [!GC_OPENBSD_UTHREADS && !NACL
&& GC_ENABLE_SUSPEND_THREAD] (GC_suspend_handler_inner): Repeat
sigsuspend() while suspend_cnt&1 and me->stop_info.ext_suspend_cnt is
not updated.
* pthread_stop_world.c [!GC_OPENBSD_UTHREADS && !NACL
&& GC_ENABLE_SUSPEND_THREAD] (GC_suspend_self_inner): Add
DISABLE_CANCEL() and RESTORE_CANCEL(); refine TODO item.
* pthread_stop_world.c [!GC_OPENBSD_UTHREADS && !NACL
&& GC_ENABLE_SUSPEND_THREAD && DEBUG_THREADS] (GC_suspend_self_inner):
Log "suspend self" and "resume self" events.
* pthread_stop_world.c [!GC_OPENBSD_UTHREADS && !NACL
&& GC_ENABLE_SUSPEND_THREAD] (GC_suspend_thread): Rename
saved_stop_count local variable to next_stop_count; add assertion
that self thread is not suspended; replace sem_wait() in a loop to
suspend_restart_barrier(1); increment GC_stop_count on exit of the
function as well (instead of restore).
* pthread_stop_world.c [!GC_OPENBSD_UTHREADS && !NACL
&& GC_ENABLE_SUSPEND_THREAD] (GC_resume_thread): Add assertion that
GC_stop_count is odd; call raise_signal(GC_sig_thr_restart) and
suspend_restart_barrier(1).

7317 of 9926 relevant lines covered (73.72%)

9447782.27 hits per line

Jobs
ID Job ID Ran Files Coverage
5 1287.5 (CONF_OPTIONS="--enable-gcov --enable-single-obj-compilation --enable-cplusplus --disable-shared --enable-gc-assertions" CFLAGS_EXTRA="-D USE_CUSTOM_SPECIFIC" CC_FOR_CHECK=g++ MAKEFILE_TARGETS="all" MAKEFILE_TARGETS_CHECK="check" NO_CLONE_LIBATOMIC_OPS=true REPORT_COVERAGE=true TESTS_CUSTOM_RUN=true) 0
73.72
 Travis Job 1287.5
Source Files on build 1287
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