diff options
| author | Jo-Philipp Wich <jo@mein.io> | 2023-10-15 01:17:36 +0300 |
|---|---|---|
| committer | Felix Fietkau <nbd@nbd.name> | 2023-11-02 19:49:55 +0300 |
| commit | 82fa6480de7a85d0ced0701ab7c8825e31b90770 (patch) | |
| tree | 580124998f50d5745f26d71e777ee58a1bc5a87e /uloop.h | |
| parent | 75a3b870cace1171faf57bd55e5a9a2f1564f757 (diff) | |
uloop: add support for interval timers
So far, the only way to implement periodic interval timers was to use
one-shot uloop_timeout timers which are rearmed within their completion
callback immediately on expiration.
While simple, this approach is not very precise and interval lengths will
slowly drift over time, due to callback execution overhead, scheduling
granularity etc.
In order to make uloop provide stable and precise interval timer
capabilities, this commit introduces a new `uloop_interval` structure
along with the new related `uloop_interval_set()`, `uloop_interval_cancel()`
and `uloop_interval_remaining()` api functions.
Periodic timers are implemented using the timerfd facility an Linux and
kqueue EVFILT_TIMER events on macOS/BSD.
The Lua binding has been updated to include support for the new timer type
as well.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Diffstat (limited to 'uloop.h')
| -rw-r--r-- | uloop.h | 20 |
1 files changed, 20 insertions, 0 deletions
@@ -35,10 +35,12 @@ struct uloop_fd; struct uloop_timeout; struct uloop_process; +struct uloop_interval; typedef void (*uloop_fd_handler)(struct uloop_fd *u, unsigned int events); typedef void (*uloop_timeout_handler)(struct uloop_timeout *t); typedef void (*uloop_process_handler)(struct uloop_process *c, int ret); +typedef void (*uloop_interval_handler)(struct uloop_interval *t); #define ULOOP_READ (1 << 0) #define ULOOP_WRITE (1 << 1) @@ -83,6 +85,20 @@ struct uloop_process pid_t pid; }; +struct uloop_interval +{ + uloop_interval_handler cb; + uint64_t expirations; + + union { + struct uloop_fd ufd; + struct { + int64_t fired; + unsigned int msecs; + } time; + } private; +}; + extern bool uloop_cancelled; extern bool uloop_handle_sigchld; extern uloop_fd_handler uloop_fd_set_cb; @@ -100,6 +116,10 @@ int64_t uloop_timeout_remaining64(struct uloop_timeout *timeout); int uloop_process_add(struct uloop_process *p); int uloop_process_delete(struct uloop_process *p); +int uloop_interval_set(struct uloop_interval *timer, unsigned int msecs); +int uloop_interval_cancel(struct uloop_interval *timer); +int64_t uloop_interval_remaining(struct uloop_interval *timer); + bool uloop_cancelling(void); static inline void uloop_end(void) |