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use a separate signal from SIGCANCEL for SIGEV_THREAD timers

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otherwise we cannot support an application's desire to use
asynchronous cancellation within the callback function. this change
also slightly debloats pthread_create.c.
This commit is contained in:
Rich Felker
2011-04-14 12:51:00 -04:00
parent 9beb6330c0
commit 016a5dc192
6 changed files with 29 additions and 11 deletions
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32
src/time/timer_create.c
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@ -21,22 +21,38 @@ weak_alias(dummy_1, __pthread_tsd_run_dtors);
static void cleanup_fromsig(void *p)
{
pthread_t self = __pthread_self();
__pthread_tsd_run_dtors(self);
self->cancel = 0;
self->cancelbuf = 0;
__pthread_tsd_run_dtors(self);
self->canceldisable = 0;
self->cancelasync = 0;
self->unblock_cancel = 0;
longjmp(p, 1);
}
void __sigtimer_handler(pthread_t self)
static void timer_handler(int sig, siginfo_t *si, void *ctx)
{
pthread_t self = __pthread_self();
jmp_buf jb;
void (*notify)(union sigval) = (void (*)(union sigval))self->start;
union sigval val = { .sival_ptr = self->start_arg };
if (setjmp(jb)) return;
pthread_cleanup_push(cleanup_fromsig, jb);
notify(val);
pthread_cleanup_pop(0);
if (!setjmp(jb) && si->si_code == SI_TIMER) {
pthread_cleanup_push(cleanup_fromsig, jb);
notify(val);
pthread_cleanup_pop(0);
}
}
static void install_handler()
{
struct sigaction sa = {
.sa_sigaction = timer_handler,
.sa_flags = SA_SIGINFO | SA_RESTART
};
__libc_sigaction(SIGTIMER, &sa, 0);
sigaddset(&sa.sa_mask, SIGTIMER);
__libc_sigprocmask(SIG_UNBLOCK, &sa.sa_mask, 0);
}
static void *start(void *arg)
@ -58,6 +74,7 @@ static void *start(void *arg)
int timer_create(clockid_t clk, struct sigevent *evp, timer_t *res)
{
static pthread_once_t once = PTHREAD_ONCE_INIT;
pthread_t td;
pthread_attr_t attr;
int r;
@ -80,6 +97,7 @@ int timer_create(clockid_t clk, struct sigevent *evp, timer_t *res)
*res = (void *)timerid;
break;
case SIGEV_THREAD:
pthread_once(&once, install_handler);
if (evp->sigev_notify_attributes)
attr = *evp->sigev_notify_attributes;
else
@ -93,7 +111,7 @@ int timer_create(clockid_t clk, struct sigevent *evp, timer_t *res)
return -1;
}
ksev.sigev_value.sival_ptr = 0;
ksev.sigev_signo = SIGCANCEL;
ksev.sigev_signo = SIGTIMER;
ksev.sigev_notify = 4; /* SIGEV_THREAD_ID */
ksev.sigev_tid = td->tid;
r = syscall(SYS_timer_create, clk, &ksev, &timerid);