void
runtime·cgocallbackg(void)
{
if(g != m->curg) {
runtime·prints("runtime: bad g in cgocallback");
runtime·exit(2);
}
runtime·exitsyscall(); // coming out of cgo call
runtime·cgocallbackg1();
runtime·entersyscall(); // going back to cgo call
}
void
runtime·cgocallbackg(void)
{
if(g != m->curg) {
runtime·prints("runtime: bad g in cgocallback");
runtime·exit(2);
}
if(m->racecall) {
// We were not in syscall, so no need to call runtime·exitsyscall.
// However we must set m->locks for the following reason.
// Race detector runtime makes __tsan_symbolize cgo callback
// holding internal mutexes. The mutexes are not cooperative with Go scheduler.
// So if we deschedule a goroutine that holds race detector internal mutex
// (e.g. preempt it), another goroutine will deadlock trying to acquire the same mutex.
m->locks++;
runtime·cgocallbackg1();
m->locks--;
} else {
runtime·exitsyscall(); // coming out of cgo call
runtime·cgocallbackg1();
runtime·entersyscall(); // going back to cgo call
}
}
