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Reduce code size of mandatory runtime

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This change reduces o/tiny/examples/life from 44kb to 24kb in size since
it avoids linking mmap() when unnecessary. This is important, to helping
cosmo not completely lose touch with its roots.
This commit is contained in:
Justine Tunney 2024-07-04 02:50:20 -07:00
parent fdab49b30e
commit 15ea0524b3
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GPG key ID: BE714B4575D6E328
17 changed files with 164 additions and 163 deletions
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21
libc/proc/fork.c
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@ -45,7 +45,8 @@
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/tls.h"
extern atomic_uint free_waiters_mu;
extern pthread_mutex_t nsync_waiters_mu;
extern pthread_mutex_t _pthread_lock_obj;
static void _onfork_prepare(void) {
if (_weaken(_pthread_onfork_prepare))
@ -53,12 +54,11 @@ static void _onfork_prepare(void) {
_pthread_lock();
__maps_lock();
__fds_lock();
while (atomic_exchange_explicit(&free_waiters_mu, 1, memory_order_acquire)) {
}
pthread_mutex_lock(&nsync_waiters_mu);
}
static void _onfork_parent(void) {
atomic_store_explicit(&free_waiters_mu, 0, memory_order_release);
pthread_mutex_unlock(&nsync_waiters_mu);
__fds_unlock();
__maps_unlock();
_pthread_unlock();
@ -67,13 +67,9 @@ static void _onfork_parent(void) {
}
static void _onfork_child(void) {
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&__fds_lock_obj, &attr);
atomic_store_explicit(&free_waiters_mu, 0, memory_order_relaxed);
pthread_mutexattr_destroy(&attr);
_pthread_init();
__fds_lock_obj = (pthread_mutex_t)PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
nsync_waiters_mu = (pthread_mutex_t)PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
_pthread_lock_obj = (pthread_mutex_t)PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
atomic_store_explicit(&__maps.lock, 0, memory_order_relaxed);
atomic_store_explicit(&__get_tls()->tib_relock_maps, 0, memory_order_relaxed);
if (_weaken(_pthread_onfork_child))
@ -138,9 +134,8 @@ int _fork(uint32_t dwCreationFlags) {
atomic_store_explicit(&pt->pt_canceled, false, memory_order_relaxed);
// run user fork callbacks
if (__threaded) {
if (__threaded)
_onfork_child();
}
STRACE("fork() → 0 (child of %d)", parent);
} else {
// this is the parent process