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https://github.com/jart/cosmopolitan.git
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3b4dbc9fdd
This change deletes mkfifo() so that GNU Make on Windows will work in parallel mode using its pipe-based implementation. There's an example called greenbean2 now, which shows how to build a scalable web server for Windows with 10k+ threads. The accuracy of clock_nanosleep is now significantly improved on Linux.
109 lines
4.8 KiB
C
109 lines
4.8 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2016 Google Inc. │
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│ │
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│ Licensed under the Apache License, Version 2.0 (the "License"); │
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│ you may not use this file except in compliance with the License. │
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│ You may obtain a copy of the License at │
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│ │
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│ http://www.apache.org/licenses/LICENSE-2.0 │
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│ │
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│ Unless required by applicable law or agreed to in writing, software │
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│ distributed under the License is distributed on an "AS IS" BASIS, │
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│ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. │
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│ See the License for the specific language governing permissions and │
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│ limitations under the License. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "third_party/nsync/mu_semaphore.h"
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#include "libc/calls/cp.internal.h"
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#include "libc/dce.h"
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#include "third_party/nsync/mu_semaphore.internal.h"
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/* Apple's ulock (part by Cosmo futexes) is an internal API, but:
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1. Unlike GCD it's cancellable, i.e. can be EINTR'd by signals
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2. We currently always use ulock anyway for joining threads */
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#define PREFER_GCD_OVER_ULOCK 0
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asm(".ident\t\"\\n\\n\
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*NSYNC (Apache 2.0)\\n\
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Copyright 2016 Google, Inc.\\n\
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https://github.com/google/nsync\"");
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// clang-format off
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/* Initialize *s; the initial value is 0. */
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void nsync_mu_semaphore_init (nsync_semaphore *s) {
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if (PREFER_GCD_OVER_ULOCK && IsXnuSilicon ()) {
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return nsync_mu_semaphore_init_gcd (s);
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} else if (IsNetbsd ()) {
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return nsync_mu_semaphore_init_sem (s);
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} else if (IsWindows ()) {
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return nsync_mu_semaphore_init_win32 (s);
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} else {
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return nsync_mu_semaphore_init_futex (s);
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}
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}
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/* Releases system resources associated with *s. */
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void nsync_mu_semaphore_destroy (nsync_semaphore *s) {
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if (PREFER_GCD_OVER_ULOCK && IsXnuSilicon ()) {
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return nsync_mu_semaphore_destroy_gcd (s);
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} else if (IsNetbsd ()) {
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return nsync_mu_semaphore_destroy_sem (s);
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} else if (IsWindows ()) {
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return nsync_mu_semaphore_destroy_win32 (s);
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}
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}
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/* Wait until the count of *s exceeds 0, and decrement it. If POSIX cancellations
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are currently disabled by the thread, then this function always succeeds. When
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they're enabled in MASKED mode, this function may return ECANCELED. Otherwise,
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cancellation will occur by unwinding cleanup handlers pushed to the stack. */
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errno_t nsync_mu_semaphore_p (nsync_semaphore *s) {
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errno_t err;
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BEGIN_CANCELATION_POINT;
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if (PREFER_GCD_OVER_ULOCK && IsXnuSilicon ()) {
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err = nsync_mu_semaphore_p_gcd (s);
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} else if (IsNetbsd ()) {
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err = nsync_mu_semaphore_p_sem (s);
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} else if (IsWindows ()) {
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err = nsync_mu_semaphore_p_win32 (s);
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} else {
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err = nsync_mu_semaphore_p_futex (s);
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}
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END_CANCELATION_POINT;
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return err;
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}
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/* Like nsync_mu_semaphore_p() this waits for the count of *s to exceed 0,
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while additionally supporting a time parameter specifying at what point
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in the future ETIMEDOUT should be returned, if neither cancelation, or
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semaphore release happens. */
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errno_t nsync_mu_semaphore_p_with_deadline (nsync_semaphore *s, nsync_time abs_deadline) {
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errno_t err;
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BEGIN_CANCELATION_POINT;
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if (PREFER_GCD_OVER_ULOCK && IsXnuSilicon ()) {
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err = nsync_mu_semaphore_p_with_deadline_gcd (s, abs_deadline);
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} else if (IsNetbsd ()) {
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err = nsync_mu_semaphore_p_with_deadline_sem (s, abs_deadline);
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} else if (IsWindows ()) {
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err = nsync_mu_semaphore_p_with_deadline_win32 (s, abs_deadline);
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} else {
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err = nsync_mu_semaphore_p_with_deadline_futex (s, abs_deadline);
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}
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END_CANCELATION_POINT;
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return err;
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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 (nsync_semaphore *s) {
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if (PREFER_GCD_OVER_ULOCK && IsXnuSilicon ()) {
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return nsync_mu_semaphore_v_gcd (s);
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} else if (IsNetbsd ()) {
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return nsync_mu_semaphore_v_sem (s);
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} else if (IsWindows ()) {
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return nsync_mu_semaphore_v_win32 (s);
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} else {
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return nsync_mu_semaphore_v_futex (s);
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}
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}
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