| /* |
| * Copyright © 2007 Chris Wilson |
| * Copyright © 2009,2010 Red Hat, Inc. |
| * Copyright © 2011,2012 Google, Inc. |
| * |
| * This is part of HarfBuzz, a text shaping library. |
| * |
| * Permission is hereby granted, without written agreement and without |
| * license or royalty fees, to use, copy, modify, and distribute this |
| * software and its documentation for any purpose, provided that the |
| * above copyright notice and the following two paragraphs appear in |
| * all copies of this software. |
| * |
| * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
| * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
| * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
| * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| * |
| * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
| * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
| * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
| * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| * |
| * Contributor(s): |
| * Chris Wilson <chris@chris-wilson.co.uk> |
| * Red Hat Author(s): Behdad Esfahbod |
| * Google Author(s): Behdad Esfahbod |
| */ |
| |
| #ifndef HB_MUTEX_HH |
| #define HB_MUTEX_HH |
| |
| #include "hb.hh" |
| |
| |
| /* mutex */ |
| |
| /* We need external help for these */ |
| |
| #if defined(HB_MUTEX_IMPL_INIT) \ |
| && defined(hb_mutex_impl_init) \ |
| && defined(hb_mutex_impl_lock) \ |
| && defined(hb_mutex_impl_unlock) \ |
| && defined(hb_mutex_impl_finish) |
| |
| /* Defined externally, i.e. in config.h; must have typedef'ed hb_mutex_impl_t as well. */ |
| |
| |
| #elif !defined(HB_NO_MT) && (defined(_WIN32) || defined(__CYGWIN__)) |
| |
| #include <windows.h> |
| typedef CRITICAL_SECTION hb_mutex_impl_t; |
| #define HB_MUTEX_IMPL_INIT {0} |
| #if defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP) |
| #define hb_mutex_impl_init(M) InitializeCriticalSectionEx (M, 0, 0) |
| #else |
| #define hb_mutex_impl_init(M) InitializeCriticalSection (M) |
| #endif |
| #define hb_mutex_impl_lock(M) EnterCriticalSection (M) |
| #define hb_mutex_impl_unlock(M) LeaveCriticalSection (M) |
| #define hb_mutex_impl_finish(M) DeleteCriticalSection (M) |
| |
| |
| #elif !defined(HB_NO_MT) && (defined(HAVE_PTHREAD) || defined(__APPLE__)) |
| |
| #include <pthread.h> |
| typedef pthread_mutex_t hb_mutex_impl_t; |
| #define HB_MUTEX_IMPL_INIT PTHREAD_MUTEX_INITIALIZER |
| #define hb_mutex_impl_init(M) pthread_mutex_init (M, nullptr) |
| #define hb_mutex_impl_lock(M) pthread_mutex_lock (M) |
| #define hb_mutex_impl_unlock(M) pthread_mutex_unlock (M) |
| #define hb_mutex_impl_finish(M) pthread_mutex_destroy (M) |
| |
| |
| #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES) |
| |
| #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD) |
| # include <sched.h> |
| # define HB_SCHED_YIELD() sched_yield () |
| #else |
| # define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END |
| #endif |
| |
| /* This actually is not a totally awful implementation. */ |
| typedef volatile int hb_mutex_impl_t; |
| #define HB_MUTEX_IMPL_INIT 0 |
| #define hb_mutex_impl_init(M) *(M) = 0 |
| #define hb_mutex_impl_lock(M) HB_STMT_START { while (__sync_lock_test_and_set((M), 1)) HB_SCHED_YIELD (); } HB_STMT_END |
| #define hb_mutex_impl_unlock(M) __sync_lock_release (M) |
| #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END |
| |
| |
| #elif !defined(HB_NO_MT) |
| |
| #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD) |
| # include <sched.h> |
| # define HB_SCHED_YIELD() sched_yield () |
| #else |
| # define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END |
| #endif |
| |
| #define HB_MUTEX_INT_NIL 1 /* Warn that fallback implementation is in use. */ |
| typedef volatile int hb_mutex_impl_t; |
| #define HB_MUTEX_IMPL_INIT 0 |
| #define hb_mutex_impl_init(M) *(M) = 0 |
| #define hb_mutex_impl_lock(M) HB_STMT_START { while (*(M)) HB_SCHED_YIELD (); (*(M))++; } HB_STMT_END |
| #define hb_mutex_impl_unlock(M) (*(M))--; |
| #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END |
| |
| |
| #else /* HB_NO_MT */ |
| |
| typedef int hb_mutex_impl_t; |
| #define HB_MUTEX_IMPL_INIT 0 |
| #define hb_mutex_impl_init(M) HB_STMT_START {} HB_STMT_END |
| #define hb_mutex_impl_lock(M) HB_STMT_START {} HB_STMT_END |
| #define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END |
| #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END |
| |
| |
| #endif |
| |
| |
| #define HB_MUTEX_INIT {HB_MUTEX_IMPL_INIT} |
| |
| struct hb_mutex_t |
| { |
| /* TODO Add tracing. */ |
| |
| hb_mutex_impl_t m; |
| |
| inline void init (void) { hb_mutex_impl_init (&m); } |
| inline void lock (void) { hb_mutex_impl_lock (&m); } |
| inline void unlock (void) { hb_mutex_impl_unlock (&m); } |
| inline void fini (void) { hb_mutex_impl_finish (&m); } |
| }; |
| |
| struct hb_lock_t |
| { |
| inline hb_lock_t (hb_mutex_t &mutex_) : mutex (mutex_) { mutex.lock (); } |
| inline ~hb_lock_t (void) { mutex.unlock (); } |
| private: |
| hb_mutex_t &mutex; |
| }; |
| |
| |
| #endif /* HB_MUTEX_HH */ |