/src/gdal/curl/lib/easy_lock.h
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1 | | #ifndef HEADER_CURL_EASY_LOCK_H |
2 | | #define HEADER_CURL_EASY_LOCK_H |
3 | | /*************************************************************************** |
4 | | * _ _ ____ _ |
5 | | * Project ___| | | | _ \| | |
6 | | * / __| | | | |_) | | |
7 | | * | (__| |_| | _ <| |___ |
8 | | * \___|\___/|_| \_\_____| |
9 | | * |
10 | | * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. |
11 | | * |
12 | | * This software is licensed as described in the file COPYING, which |
13 | | * you should have received as part of this distribution. The terms |
14 | | * are also available at https://curl.se/docs/copyright.html. |
15 | | * |
16 | | * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
17 | | * copies of the Software, and permit persons to whom the Software is |
18 | | * furnished to do so, under the terms of the COPYING file. |
19 | | * |
20 | | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
21 | | * KIND, either express or implied. |
22 | | * |
23 | | * SPDX-License-Identifier: curl |
24 | | * |
25 | | ***************************************************************************/ |
26 | | |
27 | | #include "curl_setup.h" |
28 | | |
29 | | #define GLOBAL_INIT_IS_THREADSAFE |
30 | | |
31 | | #if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x600 |
32 | | |
33 | | #ifdef __MINGW32__ |
34 | | #ifndef SRWLOCK_INIT |
35 | | #define SRWLOCK_INIT NULL |
36 | | #endif |
37 | | #endif /* __MINGW32__ */ |
38 | | |
39 | | #define curl_simple_lock SRWLOCK |
40 | | #define CURL_SIMPLE_LOCK_INIT SRWLOCK_INIT |
41 | | |
42 | | #define curl_simple_lock_lock(m) AcquireSRWLockExclusive(m) |
43 | | #define curl_simple_lock_unlock(m) ReleaseSRWLockExclusive(m) |
44 | | |
45 | | #elif defined(HAVE_ATOMIC) && defined(HAVE_STDATOMIC_H) |
46 | | #include <stdatomic.h> |
47 | | #if defined(HAVE_SCHED_YIELD) |
48 | | #include <sched.h> |
49 | | #endif |
50 | | |
51 | | #define curl_simple_lock atomic_int |
52 | | #define CURL_SIMPLE_LOCK_INIT 0 |
53 | | |
54 | | /* a clang-thing */ |
55 | | #ifndef __has_builtin |
56 | | #define __has_builtin(x) 0 |
57 | | #endif |
58 | | |
59 | | #ifndef __INTEL_COMPILER |
60 | | /* The Intel compiler tries to look like GCC *and* clang *and* lies in its |
61 | | __has_builtin() function, so override it. */ |
62 | | |
63 | | /* if GCC on i386/x86_64 or if the built-in is present */ |
64 | | #if ( (defined(__GNUC__) && !defined(__clang__)) && \ |
65 | | (defined(__i386__) || defined(__x86_64__))) || \ |
66 | | __has_builtin(__builtin_ia32_pause) |
67 | | #define HAVE_BUILTIN_IA32_PAUSE |
68 | | #endif |
69 | | |
70 | | #endif |
71 | | |
72 | | static CURL_INLINE void curl_simple_lock_lock(curl_simple_lock *lock) |
73 | 79.0k | { |
74 | 79.0k | for(;;) { |
75 | 79.0k | if(!atomic_exchange_explicit(lock, true, memory_order_acquire)) |
76 | 79.0k | break; |
77 | | /* Reduce cache coherency traffic */ |
78 | 0 | while(atomic_load_explicit(lock, memory_order_relaxed)) { |
79 | | /* Reduce load (not mandatory) */ |
80 | 0 | #ifdef HAVE_BUILTIN_IA32_PAUSE |
81 | 0 | __builtin_ia32_pause(); |
82 | | #elif defined(__aarch64__) |
83 | | __asm__ volatile("yield" ::: "memory"); |
84 | | #elif defined(_WIN32) |
85 | | Sleep(1); |
86 | | #elif defined(HAVE_SCHED_YIELD) |
87 | | sched_yield(); |
88 | | #endif |
89 | 0 | } |
90 | 0 | } |
91 | 79.0k | } easy.c:curl_simple_lock_lock Line | Count | Source | 73 | 79.0k | { | 74 | 79.0k | for(;;) { | 75 | 79.0k | if(!atomic_exchange_explicit(lock, true, memory_order_acquire)) | 76 | 79.0k | break; | 77 | | /* Reduce cache coherency traffic */ | 78 | 0 | while(atomic_load_explicit(lock, memory_order_relaxed)) { | 79 | | /* Reduce load (not mandatory) */ | 80 | 0 | #ifdef HAVE_BUILTIN_IA32_PAUSE | 81 | 0 | __builtin_ia32_pause(); | 82 | | #elif defined(__aarch64__) | 83 | | __asm__ volatile("yield" ::: "memory"); | 84 | | #elif defined(_WIN32) | 85 | | Sleep(1); | 86 | | #elif defined(HAVE_SCHED_YIELD) | 87 | | sched_yield(); | 88 | | #endif | 89 | 0 | } | 90 | 0 | } | 91 | 79.0k | } |
Unexecuted instantiation: hostip.c:curl_simple_lock_lock Unexecuted instantiation: version.c:curl_simple_lock_lock |
92 | | |
93 | | static CURL_INLINE void curl_simple_lock_unlock(curl_simple_lock *lock) |
94 | 79.0k | { |
95 | 79.0k | atomic_store_explicit(lock, false, memory_order_release); |
96 | 79.0k | } easy.c:curl_simple_lock_unlock Line | Count | Source | 94 | 79.0k | { | 95 | 79.0k | atomic_store_explicit(lock, false, memory_order_release); | 96 | 79.0k | } |
Unexecuted instantiation: hostip.c:curl_simple_lock_unlock Unexecuted instantiation: version.c:curl_simple_lock_unlock |
97 | | |
98 | | #elif defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H) |
99 | | |
100 | | #include <pthread.h> |
101 | | |
102 | | #define curl_simple_lock pthread_mutex_t |
103 | | #define CURL_SIMPLE_LOCK_INIT PTHREAD_MUTEX_INITIALIZER |
104 | | #define curl_simple_lock_lock(m) pthread_mutex_lock(m) |
105 | | #define curl_simple_lock_unlock(m) pthread_mutex_unlock(m) |
106 | | |
107 | | #else |
108 | | |
109 | | #undef GLOBAL_INIT_IS_THREADSAFE |
110 | | |
111 | | #endif |
112 | | |
113 | | #endif /* HEADER_CURL_EASY_LOCK_H */ |