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lib: make curl_global_init() threadsafe when possible
Use a posix pthread or a Windows SRWLOCK to lock curl_global_init*() and curl_global_cleanup(). Closes #8680
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@@ -262,6 +262,7 @@ LIB_HFILES = \ | |
doh.h \ | ||
dotdot.h \ | ||
dynbuf.h \ | ||
easy_lock.h \ | ||
easyif.h \ | ||
easyoptions.h \ | ||
escape.h \ | ||
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@@ -0,0 +1,69 @@ | ||
/*************************************************************************** | ||
* _ _ ____ _ | ||
* Project ___| | | | _ \| | | ||
* / __| | | | |_) | | | ||
* | (__| |_| | _ <| |___ | ||
* \___|\___/|_| \_\_____| | ||
* | ||
* Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al. | ||
* | ||
* This software is licensed as described in the file COPYING, which | ||
* you should have received as part of this distribution. The terms | ||
* are also available at https://curl.se/docs/copyright.html. | ||
* | ||
* You may opt to use, copy, modify, merge, publish, distribute and/or sell | ||
* copies of the Software, and permit persons to whom the Software is | ||
* furnished to do so, under the terms of the COPYING file. | ||
* | ||
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
* KIND, either express or implied. | ||
* | ||
***************************************************************************/ | ||
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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 | ||
#define CURL_SIMPLE_LOCK_INIT SRWLOCK_INIT | ||
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#define curl_simple_lock_lock(m) AcquireSRWLockExclusive(m) | ||
#define curl_simple_lock_unlock(m) ReleaseSRWLockExclusive(m) | ||
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#elif defined (HAVE_ATOMIC) | ||
#include <stdatomic.h> | ||
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#define curl_simple_lock atomic_bool | ||
#define CURL_SIMPLE_LOCK_INIT ATOMIC_VAR_INIT(false) | ||
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static inline void curl_simple_lock_lock(curl_simple_lock *lock) | ||
{ | ||
for(;;) { | ||
if(!atomic_exchange_explicit(lock, true, memory_order_acquire)) | ||
break; | ||
/* Reduce cache coherency traffic */ | ||
while(atomic_load_explicit(lock, memory_order_relaxed)) { | ||
/* Reduce load (not mandatory) */ | ||
#if defined(__i386__) || defined(__x86_64__) | ||
__builtin_ia32_pause(); | ||
#elif defined(__aarch64__) | ||
asm volatile("yield" ::: "memory"); | ||
#elif defined(HAVE_SCHED_YIELD) | ||
sched_yield(); | ||
#endif | ||
} | ||
} | ||
} | ||
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static inline void curl_simple_lock_unlock(curl_simple_lock *lock) | ||
{ | ||
atomic_store_explicit(lock, false, memory_order_release); | ||
} | ||
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#else | ||
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#undef GLOBAL_INIT_IS_THREADSAFE | ||
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#endif |
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