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Make _Thread_local work across platforms

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We now rewrite the binary image at runtime on Windows and XNU to change
mov %fs:0,%reg instructions to use %gs instead. There's also simpler
threading API introduced by this change and it's called _spawn() and
_join(), which has replaced most clone() usage.
This commit is contained in:
Justine Tunney 2022-07-10 04:01:17 -07:00
parent e4d6e263d4
commit 5f4f6b0e69
51 changed files with 808 additions and 1043 deletions
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70
examples/thread.c
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@ -1,70 +0,0 @@
#if 0
/*─────────────────────────────────────────────────────────────────╗
│ To the extent possible under law, Justine Tunney has waived │
│ all copyright and related or neighboring rights to this file, │
│ as it is written in the following disclaimers: │
│ • http://unlicense.org/ │
│ • http://creativecommons.org/publicdomain/zero/1.0/ │
╚─────────────────────────────────────────────────────────────────*/
#endif
#include "libc/calls/calls.h"
#include "libc/dce.h"
#include "libc/intrin/kprintf.h"
#include "libc/log/log.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/thread/thread.h"
#include "libc/time/time.h"
cthread_sem_t semaphore;
_Thread_local int test_tls = 0x12345678;
static void *worker(void *arg) {
int tid;
cthread_t self;
cthread_sem_signal(&semaphore);
self = cthread_self();
tid = self->tid;
printf("[%p] %d -> %#x\n", self, tid, test_tls);
if (test_tls != 0x12345678) {
printf(".tdata test #2 failed\n");
}
return (void *)4;
}
int main() {
int rc, tid;
void *exitcode;
cthread_t self, thread;
if (IsWindows() || IsXnu()) {
fprintf(stderr,
"error: can't run example\n"
"_Thread_local only works on Linux/FreeBSD/NetBSD/OpenBSD\n");
return 1;
}
self = cthread_self();
tid = self->tid;
printf("[%p] %d -> %#x\n", self, tid, test_tls);
if (test_tls != 0x12345678) {
printf(".tdata test #1 failed\n");
}
cthread_sem_init(&semaphore, 0);
rc = cthread_create(&thread, NULL, &worker, NULL);
if (rc == 0) {
cthread_sem_wait(&semaphore, 0, NULL);
printf("thread created: %p\n", thread);
#if 1
cthread_join(thread, &exitcode);
#else
exitcode = cthread_detach(thread);
#endif
cthread_sem_signal(&semaphore);
cthread_sem_wait(&semaphore, 0, NULL);
printf("thread joined: %p -> %p\n", thread, exitcode);
} else {
fprintf(stderr, "ERROR: thread could not be started: %d\n", rc);
}
return 0;
}