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e0dd6eb4a4
- examples: sync debug output printf masks. - INSTALL-CMAKE.md: tidy up section for some options. - curl_sha512_256: delete comment suggesting an optimization. - vtls/keylog: scope a variable. - vtls/openssl: make a source code URL a permalink. - vtls/schannel: drop redundant parentheses. - test1119.pl: robustify `$1` -> `$s`. - sync arg names in comments to match the code. - tidy up and minor fixes to comments. - fix formatting/indenting/comment/newline/include nits. - move `UNITTEST` protos next to definitions, sync their argument names. - make variables static. - add parentheses to Perl `open()` calls. - drop unnecessary double quotes in Perl. - clang-format. Closes #21000
100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
#ifndef HEADER_CURL_EASY_LOCK_H
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#define HEADER_CURL_EASY_LOCK_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#define GLOBAL_INIT_IS_THREADSAFE
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#ifdef _WIN32
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#define curl_simple_lock SRWLOCK
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#define CURL_SIMPLE_LOCK_INIT SRWLOCK_INIT
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#define curl_simple_lock_lock(m) AcquireSRWLockExclusive(m)
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#define curl_simple_lock_unlock(m) ReleaseSRWLockExclusive(m)
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#elif defined(HAVE_ATOMIC) && defined(HAVE_STDATOMIC_H)
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#include <stdatomic.h>
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#ifdef HAVE_SCHED_YIELD
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#include <sched.h>
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#endif
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#define curl_simple_lock atomic_int
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#define CURL_SIMPLE_LOCK_INIT 0
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#ifndef __INTEL_COMPILER
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/* The Intel compiler tries to look like GCC *and* clang *and* lies in its
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__has_builtin() function, so override it. */
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/* if GCC on i386/x86_64 or if the built-in is present */
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#if (defined(__GNUC__) && !defined(__clang__)) && \
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(defined(__i386__) || defined(__x86_64__))
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#define HAVE_BUILTIN_IA32_PAUSE
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#elif defined(__has_builtin) /* Keep this PP check separate from others */
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#if __has_builtin(__builtin_ia32_pause)
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#define HAVE_BUILTIN_IA32_PAUSE
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#endif
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#endif
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#endif /* !__INTEL_COMPILER */
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static CURL_INLINE void curl_simple_lock_lock(curl_simple_lock *lock)
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{
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for(;;) {
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if(!atomic_exchange_explicit(lock, true, memory_order_acquire))
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break;
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/* Reduce cache coherency traffic */
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while(atomic_load_explicit(lock, memory_order_relaxed)) {
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/* Reduce load (not mandatory) */
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#ifdef HAVE_BUILTIN_IA32_PAUSE
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__builtin_ia32_pause();
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#elif defined(__aarch64__)
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__asm__ volatile("yield" ::: "memory");
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#elif defined(HAVE_SCHED_YIELD)
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sched_yield();
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#endif
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}
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}
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}
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static CURL_INLINE void curl_simple_lock_unlock(curl_simple_lock *lock)
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{
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atomic_store_explicit(lock, false, memory_order_release);
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}
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#elif defined(HAVE_THREADS_POSIX)
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#define curl_simple_lock pthread_mutex_t
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#define CURL_SIMPLE_LOCK_INIT PTHREAD_MUTEX_INITIALIZER
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#define curl_simple_lock_lock(m) pthread_mutex_lock(m)
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#define curl_simple_lock_unlock(m) pthread_mutex_unlock(m)
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#else
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#undef GLOBAL_INIT_IS_THREADSAFE
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#endif
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#endif /* HEADER_CURL_EASY_LOCK_H */
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