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/*
* Copyright 2022 The Emscripten Authors. All rights reserved.
* Emscripten is available under two separate licenses, the MIT license and the
* University of Illinois/NCSA Open Source License. Both these licenses can be
* found in the LICENSE file.
*/
#include <threading_internal.h>
#include <emscripten/proxying.h>
#include <emscripten/console.h>
#include <emscripten_internal.h>
#include "pthread_impl.h"
#include "lock.h"
void do_raise(void* arg) {
int sig = (intptr_t)arg;
if (sig == SIGCANCEL) {
// For `SIGCANCEL` there is no need to actually call raise to run the
// handler function. The calling thread (the one calling `pthread_cancel`)
// will already have marked us as being cancelled. All we need to do is
// ensure that `pthread_testcancel` is eventually called and that will cause
// this thread to exit. We can't call `pthread_testcancel` here (since we
// are being called from the proxy queue process and we don't want to leave
// that in a bad state by unwinding). Instead, we rely on
// `pthread_testcancel` at the end of `_emscripten_check_mailbox`. Before
// we return, we do want to make sure we clear the keepalive state so that
// the thread will exit even if it has a reason to stay alive. TODO(sbc):
// Is this the correct behaviour, should `pthread_cancel` instead wait for
// threads to be done with outstanding work/event loops?
_emscripten_runtime_keepalive_clear();
return;
}
raise((intptr_t)sig);
}
int pthread_kill(pthread_t t, int sig) {
if (sig < 0 || sig >= _NSIG) {
return EINVAL;
}
if (t == emscripten_main_runtime_thread_id()) {
if (sig == 0) return 0; // signal == 0 is a no-op.
return ESRCH;
}
if (!t || !_emscripten_thread_is_valid(t)) {
return ESRCH;
}
if (sig == 0) return 0; // signal == 0 is a no-op.
// The job of pthread_kill is basically to run the (process-wide) signal
// handler on the target thread.
emscripten_proxy_async(emscripten_proxy_get_system_queue(), t, do_raise, (void*)(intptr_t)sig);
return 0;
}
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