pthread_rwlockattr_getpshared()
Get the process-shared attribute of a read-write lock attribute object
Synopsis:
#include <pthread.h>
int pthread_rwlockattr_getpshared(
const pthread_rwlockattr_t* attr,
int* pshared );
Arguments:
- attr
- A pointer to the pthread_rwlockattr_t object that you want to get the attribute from.
- pshared
- A pointer to a location where the function can store the process-shared attribute.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The pthread_rwlockattr_getpshared() function gets the the process-shared attribute for the read-write lock attribute object specified by attr, storing it in pshared.
To let any thread with access to the read-write lock object's memory operate it, the process-shared attribute must be set to PTHREAD_PROCESS_SHARED, even if those threads are in different processes. Set the process-shared attribute to PTHREAD_PROCESS_PRIVATE to limit access to threads in the current process.
Returns:
- EOK
- Success.
- EINVAL
- The read-write lock attribute object specified by attr is invalid.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | No |
| Signal handler | Yes |
| Thread | Yes |