PTHREAD_ONCE_INIT Macro
Purpose
Initializes a once synchronization control structure.
Library
Threads Library (libpthreads.a
)
Syntax
#include <pthread.h>
static pthread_once_t once_block = PTHREAD_ONCE_INIT;
Description
The PTHREAD_ONCE_INIT macro initializes the static once synchronization control structure once_block, used for one-time initializations with the pthread_once subroutine. The once synchronization control structure must be static to ensure the unicity of the initialization.
Note: The pthread.h file header file must be the first included file of each
source file by using the threads library. Otherwise, the
-D_THREAD_SAFE
compilation
flag must be used, or the cc_r compiler used. In this case, the flag is automatically set.