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Patch by Lucian Adrian Grijincu: Added pthread spinlock support.

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36333 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2010-04-17 19:38:01 +00:00
parent c8d939eaa8
commit ef1716f81b
3 changed files with 70 additions and 1 deletions
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13
headers/posix/pthread.h
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@ -21,10 +21,10 @@ typedef int pthread_key_t;
typedef struct _pthread_once pthread_once_t;
typedef struct _pthread_rwlock pthread_rwlock_t;
typedef struct _pthread_rwlockattr *pthread_rwlockattr_t;
typedef struct _pthread_spinlock pthread_spinlock_t;
/*
typedef struct _pthread_barrier *pthread_barrier_t;
typedef struct _pthread_barrierattr *pthread_barrierattr_t;
typedef struct _pthread_spinlock *pthread_spinlock_t;
*/
struct _pthread_mutex {
@ -64,6 +64,10 @@ struct _pthread_rwlock {
};
};
struct _pthread_spinlock {
int32_t lock;
};
#define PTHREAD_MUTEX_DEFAULT 0
#define PTHREAD_MUTEX_NORMAL 1
#define PTHREAD_MUTEX_ERRORCHECK 2
@ -206,6 +210,13 @@ extern int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *attr,
extern int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr,
int shared);
/* spinlock functions */
extern int pthread_spin_init(pthread_spinlock_t* spinlock, int pshared);
extern int pthread_spin_destroy(pthread_spinlock_t* spinlock);
extern int pthread_spin_lock(pthread_spinlock_t* spinlock);
extern int pthread_spin_trylock(pthread_spinlock_t* spinlock);
extern int pthread_spin_unlock(pthread_spinlock_t* spinlock);
/* misc. functions */
extern int pthread_atfork(void (*prepare)(void), void (*parent)(void),
void (*child)(void));

1
src/system/libroot/posix/pthread/Jamfile
View File

@ -18,5 +18,6 @@ MergeObject posix_pthread.o :
pthread_mutexattr.c
pthread_once.cpp
pthread_rwlock.cpp
pthread_spinlock.c
;

57
src/system/libroot/posix/pthread/pthread_spinlock.c Normal file
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@ -0,0 +1,57 @@
/*
* Copyright 2010, Lucian Adrian Grijincu, lucian.grijincu@gmail.com.
* Distributed under the terms of the MIT License.
*/
#include <pthread.h>
#include "pthread_private.h"
#define UNLOCKED 0
#define LOCKED 1
int
pthread_spin_init(pthread_spinlock_t* lock, int pshared)
{
// this implementation of spinlocks doesn't differentiate
// between spin locks used by threads in the same process or
// between threads of different processes.
lock->lock = UNLOCKED;
return 0;
}
int
pthread_spin_destroy(pthread_spinlock_t* lock)
{
return 0;
}
int
pthread_spin_lock(pthread_spinlock_t* lock)
{
while (atomic_test_and_set((int32*)&lock->lock, LOCKED, UNLOCKED) == LOCKED)
; // spin
return 0;
}
int
pthread_spin_trylock(pthread_spinlock_t* lock)
{
if (atomic_test_and_set((int32*)&lock->lock, LOCKED, UNLOCKED) == LOCKED)
return EBUSY;
return 0;
}
int
pthread_spin_unlock(pthread_spinlock_t* lock)
{
lock->lock = UNLOCKED;
return 0;
}