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a28f5f68b9
mingw-w64 3.0 was released on 2013-09-20. Offered by Debian jessie. 1.0 and 2.0 were released in 2011. It seems unlikely that many people use them. The oldest downloadable toolchain (that I know of) comes with 3.0. Due to this, older versions weren't CI tested, and probably seldom tested elsewhere. The last bugfix update for both 1.0 and 2.0 was released in 2015. curl can now assume availability of these 3.0 features/fixes: - 64-bit file offsets. - `ADDRESS_FAMILY` type. - `__MINGW_PRINTF_FORMAT` macro. (in public curl headers) Public curl headers keep supporting older mingw-w64 versions. Fixes #17984 Closes #18010
108 lines
3.1 KiB
C
108 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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#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x600
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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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/* a clang-thing */
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#ifndef __has_builtin
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#define __has_builtin(x) 0
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#endif
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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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__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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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(_WIN32)
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Sleep(1);
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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(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)
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#include <pthread.h>
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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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