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Fix many thread and file descriptor issues on Windows

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The greenbean web server now works nearly perfectly on Windows with over
1000 threads. But some synchronization issues still remain which prevent
us from going over nine thousand.
This commit is contained in:
Justine Tunney 2022-05-20 18:51:41 -07:00
parent 96781d0679
commit 7838edae88
32 changed files with 363 additions and 192 deletions
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25
libc/calls/interrupts-nt.c
View file

@ -23,16 +23,35 @@
#include "libc/calls/strace.internal.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/dce.h"
#include "libc/intrin/spinlock.h"
#include "libc/intrin/lockcmpxchgp.h"
#include "libc/nexgen32e/threaded.h"
_Alignas(64) static int rlock;
static privileged inline bool 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;
}
static textwindows inline void ReleaseInterruptPollLock(void) {
int zero = 0;
__atomic_store(&rlock, &zero, __ATOMIC_RELAXED);
}
textwindows bool _check_interrupts(bool restartable, struct Fd *fd) {
bool res;
if (__time_critical) return false;
if (_trylock(&__fds_lock)) 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);
res = weaken(__sig_check) && weaken(__sig_check)(restartable);
_spunlock(&__fds_lock);
ReleaseInterruptPollLock();
return res;
}