From 2f8d7092bc2c9609fa98d6888106b96f38b22828 Mon Sep 17 00:00:00 2001 From: dan miller Date: Sun, 21 Oct 2007 08:36:32 +0000 Subject: libraries moved to opensim-libs, a new repository --- libraries/sqlite/win32/mutex_unix.c | 223 ------------------------------------ 1 file changed, 223 deletions(-) delete mode 100755 libraries/sqlite/win32/mutex_unix.c (limited to 'libraries/sqlite/win32/mutex_unix.c') diff --git a/libraries/sqlite/win32/mutex_unix.c b/libraries/sqlite/win32/mutex_unix.c deleted file mode 100755 index ff088fb..0000000 --- a/libraries/sqlite/win32/mutex_unix.c +++ /dev/null @@ -1,223 +0,0 @@ -/* -** 2007 August 28 -** -** The author disclaims copyright to this source code. In place of -** a legal notice, here is a blessing: -** -** May you do good and not evil. -** May you find forgiveness for yourself and forgive others. -** May you share freely, never taking more than you give. -** -************************************************************************* -** This file contains the C functions that implement mutexes for pthreads -** -** $Id: mutex_unix.c,v 1.2 2007/08/28 22:24:35 drh Exp $ -*/ -#include "sqliteInt.h" - -/* -** The code in this file is only used if we are compiling threadsafe -** under unix with pthreads. -** -** Note that this implementation requires a version of pthreads that -** supports recursive mutexes. -*/ -#ifdef SQLITE_MUTEX_PTHREADS - -#include - -/* -** Each recursive mutex is an instance of the following structure. -*/ -struct sqlite3_mutex { - pthread_mutex_t mutex; /* Mutex controlling the lock */ - int id; /* Mutex type */ - int nRef; /* Number of entrances */ - pthread_t owner; /* Thread that is within this mutex */ -#ifdef SQLITE_DEBUG - int trace; /* True to trace changes */ -#endif -}; - -/* -** The sqlite3_mutex_alloc() routine allocates a new -** mutex and returns a pointer to it. If it returns NULL -** that means that a mutex could not be allocated. SQLite -** will unwind its stack and return an error. The argument -** to sqlite3_mutex_alloc() is one of these integer constants: -** -** -** -** The first two constants cause sqlite3_mutex_alloc() to create -** a new mutex. The new mutex is recursive when SQLITE_MUTEX_RECURSIVE -** is used but not necessarily so when SQLITE_MUTEX_FAST is used. -** The mutex implementation does not need to make a distinction -** between SQLITE_MUTEX_RECURSIVE and SQLITE_MUTEX_FAST if it does -** not want to. But SQLite will only request a recursive mutex in -** cases where it really needs one. If a faster non-recursive mutex -** implementation is available on the host platform, the mutex subsystem -** might return such a mutex in response to SQLITE_MUTEX_FAST. -** -** The other allowed parameters to sqlite3_mutex_alloc() each return -** a pointer to a static preexisting mutex. Three static mutexes are -** used by the current version of SQLite. Future versions of SQLite -** may add additional static mutexes. Static mutexes are for internal -** use by SQLite only. Applications that use SQLite mutexes should -** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or -** SQLITE_MUTEX_RECURSIVE. -** -** Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST -** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc() -** returns a different mutex on every call. But for the static -** mutex types, the same mutex is returned on every call that has -** the same type number. -*/ -sqlite3_mutex *sqlite3_mutex_alloc(int iType){ - static sqlite3_mutex staticMutexes[] = { - { PTHREAD_MUTEX_INITIALIZER, }, - { PTHREAD_MUTEX_INITIALIZER, }, - { PTHREAD_MUTEX_INITIALIZER, }, - { PTHREAD_MUTEX_INITIALIZER, }, - { PTHREAD_MUTEX_INITIALIZER, }, - }; - sqlite3_mutex *p; - switch( iType ){ - case SQLITE_MUTEX_RECURSIVE: { - p = sqlite3MallocZero( sizeof(*p) ); - if( p ){ - pthread_mutexattr_t recursiveAttr; - pthread_mutexattr_init(&recursiveAttr); - pthread_mutexattr_settype(&recursiveAttr, PTHREAD_MUTEX_RECURSIVE); - pthread_mutex_init(&p->mutex, &recursiveAttr); - pthread_mutexattr_destroy(&recursiveAttr); - p->id = iType; - } - break; - } - case SQLITE_MUTEX_FAST: { - p = sqlite3MallocZero( sizeof(*p) ); - if( p ){ - p->id = iType; - pthread_mutex_init(&p->mutex, 0); - } - break; - } - default: { - assert( iType-2 >= 0 ); - assert( iType-2 < sizeof(staticMutexes)/sizeof(staticMutexes[0]) ); - p = &staticMutexes[iType-2]; - p->id = iType; - break; - } - } - return p; -} - - -/* -** This routine deallocates a previously -** allocated mutex. SQLite is careful to deallocate every -** mutex that it allocates. -*/ -void sqlite3_mutex_free(sqlite3_mutex *p){ - assert( p ); - assert( p->nRef==0 ); - assert( p->id==SQLITE_MUTEX_FAST || p->id==SQLITE_MUTEX_RECURSIVE ); - pthread_mutex_destroy(&p->mutex); - sqlite3_free(p); -} - -/* -** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt -** to enter a mutex. If another thread is already within the mutex, -** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return -** SQLITE_BUSY. The sqlite3_mutex_try() interface returns SQLITE_OK -** upon successful entry. Mutexes created using SQLITE_MUTEX_RECURSIVE can -** be entered multiple times by the same thread. In such cases the, -** mutex must be exited an equal number of times before another thread -** can enter. If the same thread tries to enter any other kind of mutex -** more than once, the behavior is undefined. -*/ -void sqlite3_mutex_enter(sqlite3_mutex *p){ - assert( p ); - assert( p->id==SQLITE_MUTEX_RECURSIVE || sqlite3_mutex_notheld(p) ); - pthread_mutex_lock(&p->mutex); - p->owner = pthread_self(); - p->nRef++; -#ifdef SQLITE_DEBUG - if( p->trace ){ - printf("enter mutex %p (%d) with nRef=%d\n", p, p->trace, p->nRef); - } -#endif -} -int sqlite3_mutex_try(sqlite3_mutex *p){ - int rc; - assert( p ); - assert( p->id==SQLITE_MUTEX_RECURSIVE || sqlite3_mutex_notheld(p) ); - if( pthread_mutex_trylock(&p->mutex)==0 ){ - p->owner = pthread_self(); - p->nRef++; - rc = SQLITE_OK; -#ifdef SQLITE_DEBUG - if( p->trace ){ - printf("enter mutex %p (%d) with nRef=%d\n", p, p->trace, p->nRef); - } -#endif - }else{ - rc = SQLITE_BUSY; - } - return rc; -} - -/* -** The sqlite3_mutex_leave() routine exits a mutex that was -** previously entered by the same thread. The behavior -** is undefined if the mutex is not currently entered or -** is not currently allocated. SQLite will never do either. -*/ -void sqlite3_mutex_leave(sqlite3_mutex *p){ - assert( p ); - assert( sqlite3_mutex_held(p) ); - p->nRef--; - assert( p->nRef==0 || p->id==SQLITE_MUTEX_RECURSIVE ); -#ifdef SQLITE_DEBUG - if( p->trace ){ - printf("leave mutex %p (%d) with nRef=%d\n", p, p->trace, p->nRef); - } -#endif - pthread_mutex_unlock(&p->mutex); -} - -/* -** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are -** intended for use only inside assert() statements. On some platforms, -** there might be race conditions that can cause these routines to -** deliver incorrect results. In particular, if pthread_equal() is -** not an atomic operation, then these routines might delivery -** incorrect results. On most platforms, pthread_equal() is a -** comparison of two integers and is therefore atomic. But we are -** told that HPUX is not such a platform. If so, then these routines -** will not always work correctly on HPUX. -** -** On those platforms where pthread_equal() is not atomic, SQLite -** should be compiled without -DSQLITE_DEBUG and with -DNDEBUG to -** make sure no assert() statements are evaluated and hence these -** routines are never called. -*/ -#ifndef NDEBUG -int sqlite3_mutex_held(sqlite3_mutex *p){ - return p==0 || (p->nRef!=0 && pthread_equal(p->owner, pthread_self())); -} -int sqlite3_mutex_notheld(sqlite3_mutex *p){ - return p==0 || p->nRef==0 || pthread_equal(p->owner, pthread_self())==0; -} -#endif -#endif /* SQLITE_MUTEX_PTHREAD */ -- cgit v1.1