runtime/cgo: make code robust

According to http://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_key_create.html,
pthread_key_create return an error number which is greater than or equal
to 0. I don't know the scenario that pthread_setspecific would fail, but
also don't know the future. Add some error handlings just in case.

Change-Id: I0774b79ef658d67e300f4a9aab1f2e3879acc7ee
Reviewed-on: https://go-review.googlesource.com/54811Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/runtime/cgo/gcc_android_386.c

@@ -36,7 +36,7 @@ inittls(void)
 	 */
 	ntofree = 0;
 	for(;;) {
-		if(pthread_key_create(&k, nil) < 0) {
+		if(pthread_key_create(&k, nil) != 0) {
 			fprintf(stderr, "runtime/cgo: pthread_key_create failed\n");
 			abort();
 		}
@@ -77,7 +77,10 @@ threadentry(void *v)
 	ts = *(ThreadStart*)v;
 	free(v);
 
-	pthread_setspecific(k1, (void*)ts.g);
+	if (pthread_setspecific(k1, (void*)ts.g) != 0) {
+		fprintf(stderr, "runtime/cgo: pthread_setspecific failed\n");
+		abort();
+	}
 
 	crosscall_386(ts.fn);
 	return nil;

src/runtime/cgo/gcc_android_amd64.c

@@ -41,7 +41,7 @@ inittls(void)
 	 */
 	ntofree = 0;
 	for(;;) {
-		if(pthread_key_create(&k, nil) < 0) {
+		if(pthread_key_create(&k, nil) != 0) {
 			fprintf(stderr, "runtime/cgo: pthread_key_create failed\n");
 			abort();
 		}
@@ -82,7 +82,10 @@ threadentry(void *v)
 	ts = *(ThreadStart*)v;
 	free(v);
 
-	pthread_setspecific(k1, (void*)ts.g);
+	if (pthread_setspecific(k1, (void*)ts.g) != 0) {
+		fprintf(stderr, "runtime/cgo: pthread_setspecific failed\n");
+		abort();
+	}
 
 	crosscall_amd64(ts.fn);
 	return nil;

src/runtime/cgo/gcc_darwin_386.c

@@ -64,7 +64,7 @@ inittls(void)
 	 */
 	ntofree = 0;
 	for(;;) {
-		if(pthread_key_create(&k, nil) < 0) {
+		if(pthread_key_create(&k, nil) != 0) {
 			fprintf(stderr, "runtime/cgo: pthread_key_create failed\n");
 			abort();
 		}
@@ -142,7 +142,10 @@ threadentry(void *v)
 	ts = *(ThreadStart*)v;
 	free(v);
 
-	pthread_setspecific(k1, (void*)ts.g);
+	if (pthread_setspecific(k1, (void*)ts.g) != 0) {
+		fprintf(stderr, "runtime/cgo: pthread_setspecific failed\n");
+		abort();
+	}
 
 	crosscall_386(ts.fn);
 	return nil;

src/runtime/cgo/gcc_darwin_amd64.c

@@ -35,7 +35,7 @@ inittls(void)
 	 */
 	ntofree = 0;
 	for(;;) {
-		if(pthread_key_create(&k, nil) < 0) {
+		if(pthread_key_create(&k, nil) != 0) {
 			fprintf(stderr, "runtime/cgo: pthread_key_create failed\n");
 			abort();
 		}
@@ -113,7 +113,10 @@ threadentry(void *v)
 	ts = *(ThreadStart*)v;
 	free(v);
 
-	pthread_setspecific(k1, (void*)ts.g);
+	if (pthread_setspecific(k1, (void*)ts.g) != 0) {
+		fprintf(stderr, "runtime/cgo: pthread_setspecific failed\n");
+		abort();
+	}
 
 	crosscall_amd64(ts.fn);
 	return nil;