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Use re-entrant locks on stdio

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This commit is contained in:
Justine Tunney 2022-05-22 08:13:13 -07:00
parent 4e9662cbc7
commit 1f229e4efc
78 changed files with 427 additions and 179 deletions
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19
libc/calls/interrupts-nt.c
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@ -28,15 +28,18 @@
_Alignas(64) static int rlock;
static privileged inline bool AcquireInterruptPollLock(void) {
// return 0 on success, or tid of other owner
static privileged inline int AcquireInterruptPollLock(void) {
// any thread can poll for interrupts
// but it's wasteful to have every single thread doing it
int me, owner, tries;
if (!__threaded) return true;
me = gettid();
owner = 0;
if (_lockcmpxchgp(&rlock, &owner, me)) return true;
return owner == me;
int me, owner = 0;
if (__threaded) {
me = gettid();
if (!_lockcmpxchgp(&rlock, &owner, me) && owner == me) {
owner = 0;
}
}
return owner;
}
static textwindows inline void ReleaseInterruptPollLock(void) {
@ -47,7 +50,7 @@ static textwindows inline void ReleaseInterruptPollLock(void) {
textwindows bool _check_interrupts(bool restartable, struct Fd *fd) {
bool res;
if (__time_critical) return false;
if (!AcquireInterruptPollLock()) return false;
if (AcquireInterruptPollLock()) return false;
if (weaken(_check_sigalrm)) weaken(_check_sigalrm)();
if (weaken(_check_sigchld)) weaken(_check_sigchld)();
if (fd && weaken(_check_sigwinch)) weaken(_check_sigwinch)(fd);