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Get rid of kmalloc()

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This changes *NSYNC to allocate waiters on the stack so our locks don't
need to depend on dynamic memory. This make our runtiem simpler, and it
also fixes bugs with thread cancellation support.
This commit is contained in:
Justine Tunney 2023-09-11 21:34:53 -07:00
parent 77a7873057
commit a359de7893
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GPG key ID: BE714B4575D6E328
57 changed files with 405 additions and 472 deletions
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13
libc/thread/pthread_atfork.c
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@ -17,13 +17,17 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/atomic.h"
#include "libc/calls/state.internal.h"
#include "libc/cosmo.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/atomic.h"
#include "libc/intrin/dll.h"
#include "libc/intrin/kmalloc.h"
#include "libc/intrin/leaky.internal.h"
#include "libc/mem/mem.h"
#include "libc/runtime/memtrack.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/thread.h"
@ -61,11 +65,9 @@ void _pthread_onfork_prepare(void) {
pthread_spin_lock(&_pthread_lock);
__fds_lock();
__mmi_lock();
__kmalloc_lock();
}
void _pthread_onfork_parent(void) {
__kmalloc_unlock();
__mmi_unlock();
__fds_unlock();
pthread_spin_unlock(&_pthread_lock);
@ -85,7 +87,6 @@ void _pthread_onfork_child(void) {
atomic_store_explicit(&pt->cancelled, false, memory_order_relaxed);
// wipe core runtime locks
__kmalloc_unlock();
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&__mmi_lock_obj, &attr);
@ -105,7 +106,7 @@ void _pthread_onfork_child(void) {
int _pthread_atfork(atfork_f prepare, atfork_f parent, atfork_f child) {
int rc;
struct AtFork *a;
if (!(a = kmalloc(sizeof(struct AtFork)))) return ENOMEM;
if (!(a = malloc(sizeof(struct AtFork)))) return ENOMEM;
a->f[0] = prepare;
a->f[1] = parent;
a->f[2] = child;
@ -118,3 +119,5 @@ int _pthread_atfork(atfork_f prepare, atfork_f parent, atfork_f child) {
rc = 0;
return rc;
}
IGNORE_LEAKS(_pthread_atfork)