# TSContSchedule¶

## Synopsis¶

#include <ts/ts.h>

TSAction TSContSchedule(TSCont contp, ink_hrtime delay, TSThreadPool tp)

## Description¶

Schedules contp to run delay milliseconds in the future. This is approximate. The delay will be at least delay but possibly more. Resultions finer than roughly 5 milliseconds will not be effective. contp is required to have a mutex, which is provided to TSContCreate().

The return value can be used to cancel the scheduled event via TSActionCancel(). This is effective until the continuation contp is being dispatched. However, if it is scheduled on another thread this can problematic to be correctly timed. The return value can be checked with TSActionDone() to see if the continuation ran before the return, which is possible if delay is 0.

The continuation is scheduled for a particular thread selected from a group of similar threads, as indicated by tp.

Pool Properties
TS_THREAD_POOL_DEFAULT Use the default pool. Continuations using this must not block.
TS_THREAD_POOL_NET Transaction processing threads. Continuations on these threads must not block.
TS_THREAD_POOL_TASK Background threads. Continuations can perform blocking operations.
TS_THREAD_POOL_SSL DEPRECATED - these are no longer used as of ATS 6.
TS_THREAD_POOL_DNS DNS request processing. May not exist depending on configuration. Not recommended.
TS_THREAD_POOL_REMAP DEPRECATED - these are not longer used.
TS_THREAD_POOL_CLUSTER DEPRECATED - these are no longer used as of ATS 7.
TS_THREAD_POOL_UDP DEPRECATED

In practice, any choice except TS_THREAD_POOL_NET or TS_THREAD_POOL_TASK is strong not recommended. The TS_THREAD_POOL_NET threads are the same threads on which callback hooks are called and continuations that use them have the same restrictions. TS_THREAD_POOL_TASK threads are threads that exist to perform long or blocking actions, although sufficiently long operation can impact system performance by blocking other continuations on the threads.