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https://github.com/jart/cosmopolitan.git
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aca2261cda
This change refactors our POSIX signals emulation for Windows so that it performs some additional safety checks before calling SetThreadContext() which needs to be locked and must never ever interrupt Microsoft's code. Kudos to the the Go developers for figuring out how to do this properly.
74 lines
3.6 KiB
C
74 lines
3.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/sigset.internal.h"
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#include "libc/errno.h"
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#include "libc/intrin/atomic.h"
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#include "libc/nt/enum/wait.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/synchronization.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/posixthread.internal.h"
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#include "libc/thread/thread.h"
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#include "libc/thread/tls.h"
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#ifdef __x86_64__
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static textwindows int _park_thread(uint32_t msdelay, sigset_t waitmask,
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bool restartable) {
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int rc;
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int64_t sem;
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sigset_t om;
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uint32_t wi;
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struct PosixThread *pt;
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pt = _pthread_self();
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pt->pt_flags &= ~PT_RESTARTABLE;
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if (restartable) pt->pt_flags |= PT_RESTARTABLE;
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pt->pt_semaphore = sem = CreateSemaphore(0, 0, 1, 0);
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pthread_cleanup_push((void *)CloseHandle, (void *)sem);
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atomic_store_explicit(&pt->pt_blocker, PT_BLOCKER_SEM, memory_order_release);
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om = __sig_beginwait(waitmask);
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if ((rc = _check_cancel()) != -1 && (rc = _check_signal(restartable)) != -1) {
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unassert((wi = WaitForSingleObject(sem, msdelay)) != -1u);
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if (wi != kNtWaitTimeout) {
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_check_signal(false);
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rc = eintr();
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_check_cancel();
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} else if ((rc = _check_signal(restartable))) {
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_check_cancel();
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}
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}
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__sig_finishwait(om);
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atomic_store_explicit(&pt->pt_blocker, PT_BLOCKER_CPU, memory_order_release);
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pt->pt_flags &= ~PT_RESTARTABLE;
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pthread_cleanup_pop(true);
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pt->pt_semaphore = 0;
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return rc;
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}
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textwindows int _park_norestart(uint32_t msdelay, sigset_t waitmask) {
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return _park_thread(msdelay, waitmask, false);
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}
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textwindows int _park_restartable(uint32_t msdelay, sigset_t waitmask) {
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return _park_thread(msdelay, waitmask, true);
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}
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#endif /* __x86_64__ */
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