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Work towards improving signals and processes

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This commit is contained in:
Justine Tunney 2021-01-27 19:34:02 -08:00
parent de703b182c
commit d7ac16a9ed
96 changed files with 1474 additions and 427 deletions
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24
libc/calls/getpid.c
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@ -17,15 +17,16 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/bits/bits.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/dce.h"
#include "libc/nt/process.h"
#include "libc/runtime/runtime.h"
static int g_pid;
static int __pid;
static int __get_pid(void) {
static int __getpid(void) {
if (!IsWindows()) {
return getpid$sysv();
} else {
@ -33,20 +34,25 @@ static int __get_pid(void) {
}
}
static void __update_pid(void) {
g_pid = __get_pid();
static void __updatepid(void) {
__pid = __getpid();
}
/**
* Returns process id.
* @asyncsignalsafe
* @vforksafe
*/
int getpid(void) {
static bool once;
if (!once) {
__update_pid();
atfork(__update_pid, NULL);
once = true;
if (__vforked) {
return getpid$sysv();
}
return g_pid;
if (!once) {
__updatepid();
if (cmpxchg(&once, false, true)) {
atfork(__updatepid, NULL);
}
}
return __pid;
}