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Make detached threads work better

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This change adds a double linked list of threads, so that pthread_exit()
will know when it should call exit() from an orphaned child. This change
also improves ftrace and strace logging.
This commit is contained in:
Justine Tunney 2022-11-09 03:58:57 -08:00
parent b74d8c1acd
commit cee6871710
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GPG key ID: BE714B4575D6E328
37 changed files with 638 additions and 314 deletions
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23
libc/thread/wait0.c
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@ -16,10 +16,13 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/cp.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/atomic.h"
#include "libc/thread/thread.h"
#include "libc/thread/tls.h"
#include "libc/thread/wait0.internal.h"
#include "third_party/nsync/futex.internal.h"
@ -38,13 +41,21 @@
*/
errno_t _wait0(const atomic_int *ctid) {
int x, rc = 0;
BEGIN_CANCELLATION_POINT;
while ((x = atomic_load_explicit(ctid, memory_order_acquire))) {
if (nsync_futex_wait_(ctid, x, !IsWindows(), 0) == -ECANCELED) {
rc = ECANCELED;
break;
// "The behavior is undefined if the value specified by the thread
// argument to pthread_join() refers to the calling thread."
// ──Quoth POSIX.1-2017
_unassert(ctid != &__get_tls()->tib_tid);
// "If the thread calling pthread_join() is canceled, then the target
// thread shall not be detached." ──Quoth POSIX.1-2017
if (!(rc = pthread_testcancel_np())) {
BEGIN_CANCELLATION_POINT;
while ((x = atomic_load_explicit(ctid, memory_order_acquire))) {
if (nsync_futex_wait_(ctid, x, !IsWindows(), 0) == -ECANCELED) {
rc = ECANCELED;
break;
}
}
END_CANCELLATION_POINT;
}
END_CANCELLATION_POINT;
return rc;
}