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Make garbage collection thread safe

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- You can now use _gc(malloc()) in multithreaded programs
- This change fixes a bug where fork() on NT disabled TLS
- Fixed TLS code morphing on XNU/NT, for R8-R15 registers
This commit is contained in:
Justine Tunney 2022-09-08 02:33:01 -07:00
parent 571c2c3c69
commit 0e2b1bfeed
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GPG key ID: BE714B4575D6E328
37 changed files with 310 additions and 189 deletions
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5
libc/thread/pthread_create.c
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@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/intrin/asan.internal.h"
@ -24,7 +25,9 @@
#include "libc/intrin/wait0.internal.h"
#include "libc/intrin/weaken.h"
#include "libc/mem/mem.h"
#include "libc/nexgen32e/gc.internal.h"
#include "libc/nexgen32e/gettls.h"
#include "libc/nexgen32e/threaded.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/clone.h"
#include "libc/sysv/consts/map.h"
@ -56,6 +59,7 @@ static int PosixThread(void *arg, int tid) {
if (weaken(_pthread_key_destruct)) {
weaken(_pthread_key_destruct)(0);
}
cthread_ungarbage();
if (atomic_load_explicit(&pt->status, memory_order_acquire) ==
kPosixThreadDetached) {
atomic_store_explicit(&pt->status, kPosixThreadZombie,
@ -108,6 +112,7 @@ int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
int rc, e = errno;
struct PosixThread *pt;
pthread_attr_t default_attr;
TlsIsRequired();
_pthread_zombies_decimate();
// default attributes