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Add pthread_mutexattr_get/set_protocol and non-standard sem_get/set_protocol. These may use to enable or disable priority inheritance on a single semaphore.

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This commit is contained in:
Gregory Nutt
2016-11-02 09:05:18 -06:00
parent 14e06a3ce3
commit 92d3022411
18 changed files with 465 additions and 51 deletions
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include/pthread.h
+22 -4
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@@ -135,6 +135,12 @@
#define PTHREAD_BARRIER_SERIAL_THREAD 0x1000
/* Values for protocol attribute */
#define PTHREAD_PRIO_NONE SEM_PRIO_NONE
#define PTHREAD_PRIO_INHERIT SEM_PRIO_INHERIT
#define PTHREAD_PRIO_PROTECT SEM_PRIO_PROTECT
/* Definitions to map some non-standard, BSD thread management interfaces to
* the non-standard Linux-like prctl() interface. Since these are simple
* mappings to prctl, they will return 0 on success and -1 on failure with the
@@ -212,6 +218,9 @@ typedef struct pthread_cond_s pthread_cond_t;
struct pthread_mutexattr_s
{
uint8_t pshared; /* PTHREAD_PROCESS_PRIVATE or PTHREAD_PROCESS_SHARED */
#ifdef CONFIG_PRIORITY_INHERITANCE
uint8_t proto; /* See PTHREAD_PRIO_* definitions */
#endif
#ifdef CONFIG_MUTEX_TYPES
uint8_t type; /* Type of the mutex. See PTHREAD_MUTEX_* definitions */
#endif
@@ -222,11 +231,11 @@ typedef struct pthread_mutexattr_s pthread_mutexattr_t;
struct pthread_mutex_s
{
int pid; /* ID of the holder of the mutex */
sem_t sem; /* Semaphore underlying the implementation of the mutex */
int pid; /* ID of the holder of the mutex */
sem_t sem; /* Semaphore underlying the implementation of the mutex */
#ifdef CONFIG_MUTEX_TYPES
uint8_t type; /* Type of the mutex. See PTHREAD_MUTEX_* definitions */
int nlocks; /* The number of recursive locks held */
uint8_t type; /* Type of the mutex. See PTHREAD_MUTEX_* definitions */
int nlocks; /* The number of recursive locks held */
#endif
};
@@ -395,6 +404,15 @@ int pthread_mutex_lock(FAR pthread_mutex_t *mutex);
int pthread_mutex_trylock(FAR pthread_mutex_t *mutex);
int pthread_mutex_unlock(FAR pthread_mutex_t *mutex);
#ifdef CONFIG_PRIORITY_INHERITANCE
/* Manage priority inheritance */
int pthread_mutexattr_getprotocol(FAR const pthread_mutexattr_t *attr,
FAR int *protocol);
int pthread_mutexattr_setprotocol(FAR pthread_mutexattr_t *attr,
int protocol);
#endif
/* Operations on condition variables */
int pthread_condattr_init(FAR pthread_condattr_t *attr);