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michael |
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/* Routines for time-delayed actions. |
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* |
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* IRC Services is copyright (c) 1996-2009 Andrew Church. |
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* E-mail: <achurch@achurch.org> |
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* Parts written by Andrew Kempe and others. |
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* This program is free but copyrighted software; see the file GPL.txt for |
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* details. |
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*/ |
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#include "services.h" |
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#define IN_TIMEOUT_C |
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#include "timeout.h" |
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/*************************************************************************/ |
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static Timeout *timeouts = NULL; |
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static int checking_timeouts = 0; |
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/*************************************************************************/ |
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#ifdef DEBUG_COMMANDS |
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/* Send the timeout list to the given user. */ |
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void send_timeout_list(User *u) |
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{ |
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Timeout *to; |
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uint32 now = time_msec(); |
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notice(ServerName, u->nick, "Now: %u.%03u", now/1000, now%1000); |
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LIST_FOREACH (to, timeouts) { |
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notice(ServerName, u->nick, "%p: %u.%03u: %p (%p)", |
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to, to->timeout/1000, to->timeout%1000, to->code, to->data); |
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} |
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} |
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#endif /* DEBUG_COMMANDS */ |
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/*************************************************************************/ |
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/* Check the timeout list for any pending actions. */ |
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void check_timeouts(void) |
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{ |
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Timeout *to, *to2; |
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uint32 now = time_msec(); |
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if (checking_timeouts) |
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fatal("check_timeouts() called recursively!"); |
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checking_timeouts = 1; |
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log_debug(2, "Checking timeouts at time_msec = %u.%03u", |
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now/1000, now%1000); |
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LIST_FOREACH_SAFE (to, timeouts, to2) { |
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if (to->timeout) { |
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if ((int32)(to->timeout - now) > 0) |
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continue; |
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log_debug(3, "Running timeout %p (code=%p repeat=%d)", |
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to, to->code, to->repeat); |
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to->code(to); |
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if (to->repeat) { |
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to->timeout = now + to->repeat; |
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if (!to->timeout) /* watch out for zero! */ |
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to->timeout++; |
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continue; |
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} |
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} |
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LIST_REMOVE(to, timeouts); |
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free(to); |
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} |
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log_debug(2, "Finished timeout list"); |
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checking_timeouts = 0; |
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} |
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/*************************************************************************/ |
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/* Add a timeout to the list to be triggered in `delay' seconds. If |
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* `repeat' is nonzero, do not delete the timeout after it is triggered. |
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* This must maintain the property that timeouts added from within a |
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* timeout routine do not get checked during that run of the timeout list. |
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*/ |
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Timeout *add_timeout(int delay, void (*code)(Timeout *), int repeat) |
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{ |
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if (delay < 0) { |
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log("add_timeout(): called with a negative delay! (%d)", delay); |
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return NULL; |
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} |
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if (!code) { |
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log("add_timeout(): called with code==NULL!"); |
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return NULL; |
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} |
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if (delay > 2147483) { /* 2^31/1000 (watch out for difference overflow) */ |
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log("add_timeout(): delay (%ds) too long, shortening to 2147483s", |
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delay); |
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delay = 2147483; |
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} |
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return add_timeout_ms((uint32)delay*1000, code, repeat); |
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} |
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/*************************************************************************/ |
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/* The same thing, but using milliseconds instead of seconds. */ |
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Timeout *add_timeout_ms(uint32 delay, void (*code)(Timeout *), int repeat) |
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{ |
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Timeout *t; |
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if (!code) { |
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log("add_timeout_ms(): called with code==NULL!"); |
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return NULL; |
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} |
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if (delay > 2147483647) { |
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log("add_timeout_ms(): delay (%dms) too long, shortening to" |
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" 2147483647ms", delay); |
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delay = 2147483647; |
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} |
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t = malloc(sizeof(Timeout)); |
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if (!t) |
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return NULL; |
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t->settime = time(NULL); |
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t->timeout = time_msec() + delay; |
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/* t->timeout==0 is used to signal that the timeout should be deleted; |
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* if the timeout value just happens to wrap around to 0, lengthen it |
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* by a millisecond. */ |
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if (!t->timeout) |
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t->timeout++; |
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t->code = code; |
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t->data = NULL; |
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t->repeat = repeat ? delay : 0; |
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LIST_INSERT(t, timeouts); |
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return t; |
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} |
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/*************************************************************************/ |
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/* Remove a timeout from the list (if it's there). */ |
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void del_timeout(Timeout *t) |
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{ |
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Timeout *ptr; |
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if (!t) { |
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log("del_timeout(): called with t==NULL!"); |
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return; |
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} |
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LIST_FOREACH (ptr, timeouts) { |
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if (ptr == t) |
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break; |
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} |
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if (!ptr) { |
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log("del_timeout(): attempted to remove timeout %p (not on list)", t); |
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return; |
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} |
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if (checking_timeouts) { |
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t->timeout = 0; /* delete it when we hit it in the list */ |
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return; |
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} |
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LIST_REMOVE(t, timeouts); |
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free(t); |
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} |
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/*************************************************************************/ |
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/* |
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* Local variables: |
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* c-file-style: "stroustrup" |
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* c-file-offsets: ((case-label . *) (statement-case-intro . *)) |
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* indent-tabs-mode: nil |
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* End: |
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* |
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* vim: expandtab shiftwidth=4: |
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*/ |
