mirror of
https://github.com/jart/cosmopolitan.git
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7e0a09feec
This change ports APE Loader to Linux AARCH64, so that Raspberry Pi users can run programs like redbean, without the executable needing to modify itself. Progress has also slipped into this change on the issue of making progress better conforming to user expectations and industry standards regarding which symbols we're allowed to declare
106 lines
4.1 KiB
C
106 lines
4.1 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 2022 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/cp.internal.h"
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#include "libc/calls/struct/timespec.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/f.h"
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#include "third_party/nsync/mu_semaphore.h"
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#include "third_party/nsync/time.h"
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// clang-format off
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/**
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* @fileoverview Semaphores w/ POSIX Semaphores API.
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*/
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#define ASSERT(x) npassert(x)
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struct sem {
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int64_t id;
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};
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static nsync_semaphore *sem_big_enough_for_sem = (nsync_semaphore *) (uintptr_t)(1 /
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(sizeof (struct sem) <= sizeof (*sem_big_enough_for_sem)));
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/* Initialize *s; the initial value is 0. */
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void nsync_mu_semaphore_init_sem (nsync_semaphore *s) {
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int newfd;
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struct sem *f = (struct sem *) s;
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f->id = 0;
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ASSERT (!sys_sem_init (0, &f->id));
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STRACE ("sem_init(0, [%ld]) → 0", f->id);
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ASSERT ((newfd = __sys_fcntl (f->id, F_DUPFD_CLOEXEC, 100)) != -1);
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ASSERT (!sys_sem_destroy (f->id));
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f->id = newfd;
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}
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/* Wait until the count of *s exceeds 0, and decrement it. */
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errno_t nsync_mu_semaphore_p_sem (nsync_semaphore *s) {
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int e, rc;
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errno_t result;
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struct sem *f = (struct sem *) s;
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e = errno;
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BEGIN_CANCELLATION_POINT;
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rc = sys_sem_wait (f->id);
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END_CANCELLATION_POINT;
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STRACE ("sem_wait(%ld) → %d% m", f->id, rc);
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if (!rc) {
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result = 0;
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} else {
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result = errno;
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errno = e;
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ASSERT (result == ECANCELED);
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}
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return result;
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}
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/* Wait until one of:
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the count of *s is non-zero, in which case decrement *s and return 0;
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or abs_deadline expires, in which case return ETIMEDOUT. */
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errno_t nsync_mu_semaphore_p_with_deadline_sem (nsync_semaphore *s, nsync_time abs_deadline) {
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int e, rc;
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errno_t result;
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struct sem *f = (struct sem *) s;
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e = errno;
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BEGIN_CANCELLATION_POINT;
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rc = sys_sem_timedwait (f->id, &abs_deadline);
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END_CANCELLATION_POINT;
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STRACE ("sem_timedwait(%ld, %s) → %d% m", f->id,
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DescribeTimespec(0, &abs_deadline), rc);
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if (!rc) {
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result = 0;
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} else {
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result = errno;
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errno = e;
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ASSERT (result == ETIMEDOUT ||
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result == ECANCELED);
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}
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return result;
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}
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/* Ensure that the count of *s is at least 1. */
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void nsync_mu_semaphore_v_sem (nsync_semaphore *s) {
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struct sem *f = (struct sem *) s;
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ASSERT (!sys_sem_post (f->id));
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STRACE ("sem_post(%ld) → 0% m", f->id);
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}
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