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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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8
libc/intrin/wait0.c
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@ -16,10 +16,10 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/bits/atomic.h"
#include "libc/calls/calls.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/futex.internal.h"
#include "libc/intrin/wait0.internal.h"
#include "libc/linux/futex.h"
@ -31,13 +31,13 @@
* by the clone() system call when a thread terminates. The purpose of
* this operation is to know when it's safe to munmap() a thread stack.
*/
void _wait0(const int *ptid) {
void _wait0(const int *ctid) {
int x;
for (;;) {
if (!(x = atomic_load_explicit(ptid, memory_order_acquire))) {
if (!(x = atomic_load_explicit(ctid, memory_order_acquire))) {
break;
} else if (IsLinux() /* || IsOpenbsd() */) {
_futex_wait(ptid, x, &(struct timespec){2});
_futex_wait(ctid, x, &(struct timespec){2});
} else {
sched_yield();
}