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Make mutex calling code 10x tinier

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Calls to lock/unlock functions are now NOPs by default. The first time
clone() is called, they get turned into CALL instructions. Doing this
caused funcctions like fputc() to shrink from 85 bytes to 45+4 bytes.
Since the ANSI solution of `(__threaded && lock())` inlines os much
superfluous binary content into functions all over the place.
This commit is contained in:
Justine Tunney 2022-06-12 19:33:42 -07:00
parent 8cdec62f5b
commit 8b72490431
32 changed files with 494 additions and 210 deletions
Download patch file Download diff file Expand all files Collapse all files

14
libc/intrin/pthread_mutex_unlock.c
View file

@ -16,25 +16,25 @@
│ 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/intrin/kprintf.h"
#include "libc/errno.h"
#include "libc/intrin/pthread.h"
#include "libc/nexgen32e/threaded.h"
#include "libc/sysv/consts/futex.h"
/**
* Releases mutex.
* @return 0 on success or error number on failure
* @raises EPERM if in error check mode and not owned by caller
*/
int pthread_mutex_unlock(pthread_mutex_t *mutex) {
int owner;
bool shouldunlock;
assert(mutex->reent > 0);
shouldunlock = --mutex->reent <= 0;
assert(mutex->owner == gettid());
if (shouldunlock) {
if (mutex->attr == PTHREAD_MUTEX_ERRORCHECK && mutex->owner != gettid()) {
return EPERM;
}
if (!--mutex->reent) {
atomic_store_explicit(&mutex->owner, 0, memory_order_relaxed);
if (IsLinux() &&
atomic_load_explicit(&mutex->waits, memory_order_acquire)) {