eventfd_ctx_do_read

Name:eventfd_ctx_do_read

Proto:static void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt)

Type:void

Parameter:

Type	Parameter	Name
struct eventfd_ctx *	ctx
__u64 *	cnt

186

cnt = If flags & CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining* new flags, since they might collide with O_* ones. We want* to re-use O_* flags that couldn't possibly have a meaning* from eventfd, in order to leave a free define-space for* shared O_* flags. Then 1 Else * Every time that a write(2) is performed on an eventfd, the * value of the __u64 being written is added to "count" and a * wakeup is performed on "wqh". A read(2) will return the "count" * value to userspace, and will reset "count" to zero. The kernel * s

187

* Every time that a write(2) is performed on an eventfd, the * value of the __u64 being written is added to "count" and a * wakeup is performed on "wqh". A read(2) will return the "count" * value to userspace, and will reset "count" to zero. The kernel * s -= cnt

**Caller**
Name	Describe
eventfd_ctx_remove_wait_queue	ventfd_ctx_remove_wait_queue - Read the current counter and removes wait queue
eventfd_read

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