Name
eventfd_ctx_read —
Reads the eventfd counter or wait if it is zero.
Synopsis
ssize_t eventfd_ctx_read ( | struct eventfd_ctx * ctx, |
| | int no_wait, |
| | __u64 * cnt); |
Arguments
struct eventfd_ctx * ctx
[in] Pointer to eventfd context.
int no_wait
[in] Different from zero if the operation should not block.
__u64 * cnt
[out] Pointer to the 64-bit counter value.
Description
Returns 0 if successful, or the following error codes:
-EAGAIN : The operation would have blocked but no_wait was non-zero.
-ERESTARTSYS : A signal interrupted the wait operation.
If no_wait is zero, the function might sleep until the eventfd internal
counter becomes greater than zero.