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Simplify memory manager code

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Justine Tunney 2024-12-28 17:08:18 -08:00
parent 379cd77078
commit aca4214ff6
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GPG key ID: BE714B4575D6E328
11 changed files with 442 additions and 325 deletions
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24
libc/intrin/maps.c
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@ -32,6 +32,7 @@
#include "libc/runtime/stack.h"
#include "libc/sysv/consts/prot.h"
#include "libc/thread/lock.h"
#include "libc/thread/tls.h"
#ifdef __x86_64__
__static_yoink("_init_maps");
@ -124,26 +125,33 @@ privileged static void __maps_panic(const char *msg) {
}
#endif
ABI bool __maps_lock(void) {
bool __maps_held(void) {
return __tls_enabled && !(__get_tls()->tib_flags & TIB_FLAG_VFORKED) &&
MUTEX_OWNER(
atomic_load_explicit(&__maps.lock.word, memory_order_relaxed)) ==
atomic_load_explicit(&__get_tls()->tib_tid, memory_order_relaxed);
}
ABI void __maps_lock(void) {
int me;
uint64_t word, lock;
struct CosmoTib *tib;
if (!__tls_enabled)
return false;
return;
if (!(tib = __get_tls_privileged()))
return false;
return;
if (tib->tib_flags & TIB_FLAG_VFORKED)
return false;
me = atomic_load_explicit(&tib->tib_tid, memory_order_acquire);
return;
me = atomic_load_explicit(&tib->tib_tid, memory_order_relaxed);
if (me <= 0)
return false;
return;
word = atomic_load_explicit(&__maps.lock.word, memory_order_relaxed);
for (;;) {
if (MUTEX_OWNER(word) == me) {
if (atomic_compare_exchange_weak_explicit(
&__maps.lock.word, &word, MUTEX_INC_DEPTH(word),
memory_order_relaxed, memory_order_relaxed))
return true;
return;
continue;
}
#if DEBUG_MAPS_LOCK
@ -162,7 +170,7 @@ ABI bool __maps_lock(void) {
__deadlock_track(&__maps.lock, 0);
__deadlock_record(&__maps.lock, 0);
#endif
return false;
return;
}
for (;;) {
word = atomic_load_explicit(&__maps.lock.word, memory_order_relaxed);