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tsan: remember and pass original ucontext to signal handlers (instead of a fabricated one) 

llvm-svn: 159278
This commit is contained in:
Dmitry Vyukov 2012-06-27 17:35:35 +00:00
parent 70f11f88e3
commit b94a8f0c39
1 changed files with 4 additions and 5 deletions
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9
compiler-rt/lib/tsan/rtl/tsan_interceptors.cc
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@ -33,7 +33,7 @@ struct sigset_t {
};
struct ucontext_t {
u64 opaque[1024];
uptr opaque[117];
};
extern "C" int pthread_attr_init(void *attr);
@ -48,7 +48,6 @@ extern "C" int pthread_yield();
extern "C" int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
extern "C" int sigfillset(sigset_t *set);
extern "C" void *pthread_self();
extern "C" int getcontext(ucontext_t *ucp);
extern "C" void _exit(int status);
extern "C" int __cxa_atexit(void (*func)(void *arg), void *arg, void *dso);
extern "C" int *__errno_location();
@ -1289,6 +1288,8 @@ static void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
signal->sigaction = sigact;
if (info)
signal->siginfo = *info;
if (ctx)
signal->ctx = *(ucontext_t*)ctx;
sctx->pending_signal_count++;
}
}
@ -1381,9 +1382,7 @@ static void process_pending_signals(ThreadState *thr) {
thr->in_signal_handler = true;
sctx->pending_signal_count = 0;
// These are too big for stack.
static THREADLOCAL ucontext_t uctx;
static THREADLOCAL sigset_t emptyset, oldset;
getcontext(&uctx);
sigfillset(&emptyset);
pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
for (int sig = 0; sig < kSigCount; sig++) {
@ -1396,7 +1395,7 @@ static void process_pending_signals(ThreadState *thr) {
const int saved_errno = errno;
errno = 0;
if (signal->sigaction)
sigactions[sig].sa_sigaction(sig, &signal->siginfo, &uctx);
sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
else
sigactions[sig].sa_handler(sig);
if (errno != 0) {