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Initialize a condition variable
#include <pthread.h>
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
int pthread_cond_init( pthread_cond_t* cond,
pthread_condattr_t* attr );
- cond
- A pointer to the pthread_cond_t object that you want to
initialize.
- attr
- NULL, or a pointer to a pthread_condattr_t
object that specifies the attributes that you want to use for the condvar.
For more information, see
pthread_condattr_init().
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The pthread_cond_init() function initializes the condition
variable cond with the attributes in the condition variable
attribute object attr. If attr is
NULL, cond is initialized with the default
values for the attributes.
|
You should allocate synchronization objects only in normal memory mappings.
On certain processors (e.g. some PPC ones), atomic operations such as calls to
pthread_mutex_lock()
will cause a fault if the control structure is allocated in uncached memory. |
If the condition variable is statically allocated, you can initialize it
with the default attribute values by assigning to it the macro
PTHREAD_COND_INITIALIZER.
Condition variables have at least the following attributes defined:
- PTHREAD_PROCESS_PRIVATE
- The condition variable can only be accessed by threads created within
the same process as the thread that initialized the condition variable.
- PTHREAD_PROCESS_SHARED
- Any thread that has access to the memory where the condition variable
is allocated can access the condition variable.
For more information about these attributes, see
pthread_condattr_getpshared()
and
pthread_condattr_setpshared().
- EOK
- Success.
- EAGAIN
- All kernel synchronization objects are in use.
- EBUSY
- Previously initialized condition variable, cond, hasn't been destroyed.
- EFAULT
- A fault occurred when the kernel tried to access cond or attr.
- EINVAL
- The value specified by cond is invalid.
POSIX 1003.1 THR
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
pthread_condattr_init(),
pthread_cond_destroy()
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