Commit 90078aa0 authored by Dmitry Kostjuchenko's avatar Dmitry Kostjuchenko Committed by Richard Levitte
Browse files

Compile fix on platforms with missing pthread_rwlock_t. 



Fix compilation on platforms with missing pthread_rwlock_t implementation by replacing it with pthread_mutex_t. An example of such platform can be Android OS 2.0 - 2.1, API level 5 (Eclair), Android NDK platform - android-5 where pthread_rwlock_t is not implemented and is missing in pthread.h.

In case of missing pthread_rwlock_t implementation CRYPTO_RWLOCK will work as exclusive lock in write-only mode of pthread_rwlock_t lock.

The implementation based on pthread_mutex_t must be using PTHREAD_MUTEX_RECURSIVE mode to be compatible with recursive behavior of pthread_rwlock_rdlock.
Reviewed-by: default avatarRich Salz <rsalz@openssl.org>
Reviewed-by: default avatarRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1981)
(cherry picked from commit 2accf3f7)
parent d7155335

crypto/threads_pthread.c

+41 −0
Original line number Diff line number Diff line
@@ -11,8 +11,13 @@ 


#if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && !defined(OPENSSL_SYS_WINDOWS)



#ifdef PTHREAD_RWLOCK_INITIALIZER

    #define OPENSSL_THREADS_HAVE_PTHREAD_RWLOCK

#endif



CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)

{

#ifdef OPENSSL_THREADS_HAVE_PTHREAD_RWLOCK

    CRYPTO_RWLOCK *lock = OPENSSL_zalloc(sizeof(pthread_rwlock_t));

    if (lock == NULL)

        return NULL;
@@ -21,30 +26,62 @@ CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void) 
        OPENSSL_free(lock);

        return NULL;

    }

#else

    CRYPTO_RWLOCK *lock = OPENSSL_zalloc(sizeof(pthread_mutex_t));

    if (lock == NULL)

        return NULL;



    pthread_mutexattr_t attr;

    pthread_mutexattr_init(&attr);

    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);

    

    if (pthread_mutex_init(lock, &attr) != 0) {

        pthread_mutexattr_destroy(&attr);

        OPENSSL_free(lock);

        return NULL;

    }



    pthread_mutexattr_destroy(&attr);

#endif



    return lock;

}



int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)

{

#ifdef OPENSSL_THREADS_HAVE_PTHREAD_RWLOCK

    if (pthread_rwlock_rdlock(lock) != 0)

        return 0;

#else

    if (pthread_mutex_lock(lock) != 0)

        return 0;

#endif



    return 1;

}



int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)

{

#ifdef OPENSSL_THREADS_HAVE_PTHREAD_RWLOCK

    if (pthread_rwlock_wrlock(lock) != 0)

        return 0;

#else

    if (pthread_mutex_lock(lock) != 0)

        return 0;

#endif



    return 1;

}



int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)

{

#ifdef OPENSSL_THREADS_HAVE_PTHREAD_RWLOCK

    if (pthread_rwlock_unlock(lock) != 0)

        return 0;

#else

    if (pthread_mutex_unlock(lock) != 0)

        return 0;

#endif



    return 1;

}
@@ -54,7 +91,11 @@ void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock) 
    if (lock == NULL)

        return;



#ifdef OPENSSL_THREADS_HAVE_PTHREAD_RWLOCK

    pthread_rwlock_destroy(lock);

#else

    pthread_mutex_destroy(lock);

#endif

    OPENSSL_free(lock);



    return;