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authorScott MacVicar <scottmac@php.net>2008-07-24 11:24:28 +0000
committerScott MacVicar <scottmac@php.net>2008-07-24 11:24:28 +0000
commitfe8c688313c58962163d72656a5f0e2bad459460 (patch)
tree331ef4a2f61f040b24836964cea887787692a972 /ext/pdo_sqlite/sqlite/src/mutex_unix.c
parent72dfe66661ecf4bf57880978c8a76c444e1aba03 (diff)
downloadphp-git-fe8c688313c58962163d72656a5f0e2bad459460.tar.gz
Add .cvsignore, update config.w32 and remove the other bundled sqlite library
Diffstat (limited to 'ext/pdo_sqlite/sqlite/src/mutex_unix.c')
-rw-r--r--ext/pdo_sqlite/sqlite/src/mutex_unix.c298
1 files changed, 0 insertions, 298 deletions
diff --git a/ext/pdo_sqlite/sqlite/src/mutex_unix.c b/ext/pdo_sqlite/sqlite/src/mutex_unix.c
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-/*
-** 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
-**
-** $Id$
-*/
-#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 <pthread.h>
-
-
-/*
-** 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:
-**
-** <ul>
-** <li> SQLITE_MUTEX_FAST
-** <li> SQLITE_MUTEX_RECURSIVE
-** <li> SQLITE_MUTEX_STATIC_MASTER
-** <li> SQLITE_MUTEX_STATIC_MEM
-** <li> SQLITE_MUTEX_STATIC_MEM2
-** <li> SQLITE_MUTEX_STATIC_PRNG
-** <li> SQLITE_MUTEX_STATIC_LRU
-** </ul>
-**
-** 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 ){
-#ifdef SQLITE_HOMEGROWN_RECURSIVE_MUTEX
- /* If recursive mutexes are not available, we will have to
- ** build our own. See below. */
- pthread_mutex_init(&p->mutex, 0);
-#else
- /* Use a recursive mutex if it is available */
- 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);
-#endif
- 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) );
-
-#ifdef SQLITE_HOMEGROWN_RECURSIVE_MUTEX
- /* If recursive mutexes are not available, then we have to grow
- ** our own. This implementation assumes that pthread_equal()
- ** is atomic - that it cannot be deceived into thinking self
- ** and p->owner are equal if p->owner changes between two values
- ** that are not equal to self while the comparison is taking place.
- ** This implementation also assumes a coherent cache - that
- ** separate processes cannot read different values from the same
- ** address at the same time. If either of these two conditions
- ** are not met, then the mutexes will fail and problems will result.
- */
- {
- pthread_t self = pthread_self();
- if( p->nRef>0 && pthread_equal(p->owner, self) ){
- p->nRef++;
- }else{
- pthread_mutex_lock(&p->mutex);
- assert( p->nRef==0 );
- p->owner = self;
- p->nRef = 1;
- }
- }
-#else
- /* Use the built-in recursive mutexes if they are available.
- */
- pthread_mutex_lock(&p->mutex);
- p->owner = pthread_self();
- p->nRef++;
-#endif
-
-#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) );
-
-#ifdef SQLITE_HOMEGROWN_RECURSIVE_MUTEX
- /* If recursive mutexes are not available, then we have to grow
- ** our own. This implementation assumes that pthread_equal()
- ** is atomic - that it cannot be deceived into thinking self
- ** and p->owner are equal if p->owner changes between two values
- ** that are not equal to self while the comparison is taking place.
- ** This implementation also assumes a coherent cache - that
- ** separate processes cannot read different values from the same
- ** address at the same time. If either of these two conditions
- ** are not met, then the mutexes will fail and problems will result.
- */
- {
- pthread_t self = pthread_self();
- if( p->nRef>0 && pthread_equal(p->owner, self) ){
- p->nRef++;
- rc = SQLITE_OK;
- }else if( pthread_mutex_lock(&p->mutex)==0 ){
- assert( p->nRef==0 );
- p->owner = self;
- p->nRef = 1;
- rc = SQLITE_OK;
- }else{
- rc = SQLITE_BUSY;
- }
- }
-#else
- /* Use the built-in recursive mutexes if they are available.
- */
- if( pthread_mutex_trylock(&p->mutex)==0 ){
- p->owner = pthread_self();
- p->nRef++;
- rc = SQLITE_OK;
- }else{
- rc = SQLITE_BUSY;
- }
-#endif
-
-#ifdef SQLITE_DEBUG
- if( rc==SQLITE_OK && p->trace ){
- printf("enter mutex %p (%d) with nRef=%d\n", p, p->trace, p->nRef);
- }
-#endif
- 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_HOMEGROWN_RECURSIVE_MUTEX
- if( p->nRef==0 ){
- pthread_mutex_unlock(&p->mutex);
- }
-#else
- pthread_mutex_unlock(&p->mutex);
-#endif
-
-#ifdef SQLITE_DEBUG
- if( p->trace ){
- printf("leave mutex %p (%d) with nRef=%d\n", p, p->trace, p->nRef);
- }
-#endif
-}
-
-/*
-** 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 */