mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
68 lines
3.1 KiB
C
68 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2021 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/assert.h"
|
|
#include "libc/stdio/fflush.internal.h"
|
|
#include "libc/stdio/internal.h"
|
|
#include "libc/stdio/stdio.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/thread/thread.h"
|
|
|
|
/**
|
|
* Acquires reentrant lock on stdio object, blocking if needed.
|
|
*/
|
|
void flockfile(FILE *f) {
|
|
unassert(f != NULL);
|
|
pthread_mutex_lock(&f->lock);
|
|
}
|
|
|
|
void(__fflush_lock)(void) {
|
|
pthread_mutex_lock(&__fflush_lock_obj);
|
|
}
|
|
|
|
void(__fflush_unlock)(void) {
|
|
pthread_mutex_unlock(&__fflush_lock_obj);
|
|
}
|
|
|
|
static void __stdio_fork_prepare(void) {
|
|
FILE *f;
|
|
__fflush_lock();
|
|
for (int i = 0; i < __fflush.handles.i; ++i)
|
|
if ((f = __fflush.handles.p[i]))
|
|
pthread_mutex_lock(&f->lock);
|
|
}
|
|
|
|
static void __stdio_fork_parent(void) {
|
|
FILE *f;
|
|
for (int i = __fflush.handles.i; i--;)
|
|
if ((f = __fflush.handles.p[i]))
|
|
pthread_mutex_unlock(&f->lock);
|
|
__fflush_unlock();
|
|
}
|
|
|
|
static void __stdio_fork_child(void) {
|
|
FILE *f;
|
|
for (int i = __fflush.handles.i; i--;)
|
|
if ((f = __fflush.handles.p[i]))
|
|
f->lock = (pthread_mutex_t)PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
|
|
pthread_mutex_init(&__fflush_lock_obj, 0);
|
|
}
|
|
|
|
__attribute__((__constructor__(60))) static textstartup void stdioinit(void) {
|
|
pthread_atfork(__stdio_fork_prepare, __stdio_fork_parent, __stdio_fork_child);
|
|
}
|