mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
60 lines
3 KiB
C
60 lines
3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2022 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/intrin/atomic.h"
|
|
#include "libc/intrin/kmalloc.h"
|
|
#include "libc/stdio/internal.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/thread/thread.h"
|
|
|
|
static _Atomic(FILE *) __stdio_freelist;
|
|
|
|
FILE *__stdio_alloc(void) {
|
|
FILE *f;
|
|
f = atomic_load_explicit(&__stdio_freelist, memory_order_acquire);
|
|
while (f) {
|
|
if (atomic_compare_exchange_weak_explicit(
|
|
&__stdio_freelist, &f,
|
|
atomic_load_explicit(&f->next, memory_order_acquire),
|
|
memory_order_release, memory_order_relaxed)) {
|
|
atomic_store_explicit(&f->next, 0, memory_order_release);
|
|
break;
|
|
}
|
|
}
|
|
if (!f) {
|
|
f = kmalloc(sizeof(FILE));
|
|
}
|
|
if (f) {
|
|
((pthread_mutex_t *)f->lock)->_type = PTHREAD_MUTEX_RECURSIVE;
|
|
}
|
|
return f;
|
|
}
|
|
|
|
void __stdio_free(FILE *f) {
|
|
FILE *g;
|
|
bzero(f, sizeof(*f));
|
|
g = atomic_load_explicit(&__stdio_freelist, memory_order_acquire);
|
|
for (;;) {
|
|
atomic_store_explicit(&f->next, g, memory_order_release);
|
|
if (atomic_compare_exchange_weak_explicit(&__stdio_freelist, &g, f,
|
|
memory_order_release,
|
|
memory_order_relaxed)) {
|
|
break;
|
|
}
|
|
}
|
|
}
|