Synchronizing Attributes

Initialization

int pthread_mutexattr_init(pthread_mutexattr_t * attr);

int pthread_mutexattr_destroy(pthread_mutexattr_t * attr);

int pthread_condattr_init(pthread_condattr_t * attr);

int pthread_condattr_destroy(pthread_condattr_t * attr);

• The attr created is equivalent to NULL
• No static attribute initializer.

Process Shared

int pthread_mutexattr_getpshared(pthread_mutexattr_t * attr, int * state);

int pthread_mutexattr_setpshared(pthread_mutexattr_t * attr, int state);

int pthread_condattr_getpshared(pthread_condattr_t * attr, int * state);

int pthread_condattr_setpshared(pthread_condattr_t * attr, int state);

• PTHREAD_PROCESS_SHARED allows multiple processes to synchronize on the mutex or condition variable.
• User is responsible for maping the memory into the process space.
• The default is always PTHREAD_PROCESS_PRIVATE

Mutex Types

int pthread_mutexattr_gettype(pthread_mutexattr_t * attr, int * type);

int pthread_mutexattr_settype(pthread_mutexattr_t * attr, int type);

PTHREAD_MUTEXTYPE_RECURSIVE, PTHREAD_MUTEXTYPE_DEBUG

int pthread_condattr_gettype(pthread_condattr_t * attr, int * type);

int pthread_condattr_settype(pthread_condattr_t * attr, int type);

PTHREAD_CONDTYPE_RECURSIVE