simplify calling of timer signal handler

src/internal/libc.h

@@ -10,13 +10,12 @@ struct __libc {
 	void (*lock)(volatile int *);
 	void (*lockfile)(FILE *);
 	void (*fork_handler)(int);
-	void (*sigtimer)();
+	int (*rsyscall)(int, long, long, long, long, long, long);
 	int (*atexit)(void (*)(void));
 	void (*fini)(void);
 	void (*ldso_fini)(void);
 	volatile int threads_minus_1;
 	int ofl_lock;
-	int (*rsyscall)(int, long, long, long, long, long, long);
 	FILE *ofl_head;
 };
 

src/thread/pthread_create.c

@@ -4,6 +4,7 @@ static void dummy_1(pthread_t self)
 {
 }
 weak_alias(dummy_1, __pthread_tsd_run_dtors);
+weak_alias(dummy_1, __sigtimer_handler);
 
 #ifdef __pthread_unwind_next
 #undef __pthread_unwind_next
@@ -47,13 +48,9 @@ static void docancel(struct pthread *self)
 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
 {
 	struct pthread *self = __pthread_self();
-	if (!self->cancel) {
-		if (si->si_code == SI_TIMER && libc.sigtimer)
-			libc.sigtimer(sig, si, ctx);
-		return;
-	}
-	if (self->canceldisable) return;
-	if (self->cancelasync || (self->cancelpoint==1 && PC_AT_SYS(ctx)))
+	if (si->si_code == SI_TIMER) __sigtimer_handler(self);
+	if (self->cancel && !self->canceldisable &&
+	    (self->cancelasync || (self->cancelpoint==1 && PC_AT_SYS(ctx))))
 		docancel(self);
 }
 

src/time/timer_create.c

@@ -13,10 +13,9 @@ struct start_args {
 	struct sigevent *sev;
 };
 
-static void sighandler(int sig, siginfo_t *si, void *ctx)
+void __sigtimer_handler(pthread_t self)
 {
 	int st;
-	pthread_t self = __pthread_self();
 	void (*notify)(union sigval) = (void (*)(union sigval))self->start;
 	union sigval val = { .sival_ptr = self->start_arg };
 
@@ -72,7 +71,6 @@ int timer_create(clockid_t clk, struct sigevent *evp, timer_t *res)
 		*res = (void *)(2*timerid+1);
 		break;
 	case SIGEV_THREAD:
-		if (!libc.sigtimer) libc.sigtimer = sighandler;
 		if (sev.sigev_notify_attributes)
 			attr = *sev.sigev_notify_attributes;
 		else