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convert the list of scheduled items in a scheduler context to use the

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list macros.  Also, use ast_calloc instead of malloc in one place


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@24910 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Russell Bryant
2006-05-05 17:09:27 +00:00
parent 326afa4900
commit 55aab4cfbd
1 changed files with 63 additions and 71 deletions
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134
sched.c
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@@ -44,29 +44,30 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/channel.h"
#include "asterisk/lock.h"
#include "asterisk/utils.h"
#include "asterisk/linkedlists.h"
/* Determine if a is sooner than b */
#define SOONER(a,b) (((b).tv_sec > (a).tv_sec) || \
(((b).tv_sec == (a).tv_sec) && ((b).tv_usec > (a).tv_usec)))
struct sched {
struct sched *next; /*!< Next event in the list */
int id; /*!< ID number of event */
struct timeval when; /*!< Absolute time event should take place */
int resched; /*!< When to reschedule */
int variable; /*!< Use return value from callback to reschedule */
void *data; /*!< Data */
ast_sched_cb callback; /*!< Callback */
AST_LIST_ENTRY(sched) list;
int id; /*!< ID number of event */
struct timeval when; /*!< Absolute time event should take place */
int resched; /*!< When to reschedule */
int variable; /*!< Use return value from callback to reschedule */
void *data; /*!< Data */
ast_sched_cb callback; /*!< Callback */
};
struct sched_context {
ast_mutex_t lock;
int eventcnt; /*!< Number of events processed */
int schedcnt; /*!< Number of outstanding schedule events */
struct sched *schedq; /*!< Schedule entry and main queue */
int eventcnt; /*!< Number of events processed */
int schedcnt; /*!< Number of outstanding schedule events */
AST_LIST_HEAD_NOLOCK(, sched) schedq; /*!< Schedule entry and main queue */
#ifdef SCHED_MAX_CACHE
struct sched *schedc; /*!< Cache of unused schedule structures and how many */
AST_LIST_HEAD_NOLOCK(, sched) schedc; /*!< Cache of unused schedule structures and how many */
int schedccnt;
#endif
};
@@ -86,24 +87,20 @@ struct sched_context *sched_context_create(void)
void sched_context_destroy(struct sched_context *con)
{
struct sched *s, *sl;
struct sched *s;
ast_mutex_lock(&con->lock);
#ifdef SCHED_MAX_CACHE
/* Eliminate the cache */
s = con->schedc;
while(s) {
sl = s;
s = s->next;
free(sl);
}
while ((s = AST_LIST_REMOVE_HEAD(&con->schedc, list)))
free(s);
#endif
/* And the queue */
s = con->schedq;
while(s) {
sl = s;
s = s->next;
free(sl);
}
while ((s = AST_LIST_REMOVE_HEAD(&con->schedq, list)))
free(s);
/* And the context */
ast_mutex_unlock(&con->lock);
ast_mutex_destroy(&con->lock);
@@ -112,19 +109,19 @@ void sched_context_destroy(struct sched_context *con)
static struct sched *sched_alloc(struct sched_context *con)
{
struct sched *tmp;
/*
* We keep a small cache of schedule entries
* to minimize the number of necessary malloc()'s
*/
struct sched *tmp;
#ifdef SCHED_MAX_CACHE
if (con->schedc) {
tmp = con->schedc;
con->schedc = con->schedc->next;
if ((tmp = AST_LIST_REMOVE_HEAD(&con->schedc, list)))
con->schedccnt--;
} else
else
#endif
tmp = malloc(sizeof(struct sched));
tmp = ast_calloc(1, sizeof(*tmp));
return tmp;
}
@@ -137,8 +134,7 @@ static void sched_release(struct sched_context *con, struct sched *tmp)
#ifdef SCHED_MAX_CACHE
if (con->schedccnt < SCHED_MAX_CACHE) {
tmp->next = con->schedc;
con->schedc = tmp;
AST_LIST_INSERT_HEAD(&con->schedc, tmp, list);
con->schedccnt++;
} else
#endif
@@ -152,18 +148,20 @@ static void sched_release(struct sched_context *con, struct sched *tmp)
int ast_sched_wait(struct sched_context *con)
{
int ms;
DEBUG(ast_log(LOG_DEBUG, "ast_sched_wait()\n"));
ast_mutex_lock(&con->lock);
if (!con->schedq) {
if (AST_LIST_EMPTY(&con->schedq)) {
ms = -1;
} else {
ms = ast_tvdiff_ms(con->schedq->when, ast_tvnow());
ms = ast_tvdiff_ms(AST_LIST_FIRST(&con->schedq)->when, ast_tvnow());
if (ms < 0)
ms = 0;
}
ast_mutex_unlock(&con->lock);
return ms;
}
@@ -175,20 +173,18 @@ int ast_sched_wait(struct sched_context *con)
static void schedule(struct sched_context *con, struct sched *s)
{
struct sched *last=NULL;
struct sched *current=con->schedq;
while(current) {
if (SOONER(s->when, current->when))
struct sched *cur = NULL;
AST_LIST_TRAVERSE_SAFE_BEGIN(&con->schedq, cur, list) {
if (SOONER(s->when, cur->when)) {
AST_LIST_INSERT_BEFORE_CURRENT(&con->schedq, s, list);
break;
last = current;
current = current->next;
}
}
/* Insert this event into the schedule */
s->next = current;
if (last)
last->next = s;
else
con->schedq = s;
AST_LIST_TRAVERSE_SAFE_END
if (!cur)
AST_LIST_INSERT_TAIL(&con->schedq, s, list);
con->schedcnt++;
}
@@ -231,7 +227,6 @@ int ast_sched_add_variable(struct sched_context *con, int when, ast_sched_cb cal
tmp->data = data;
tmp->resched = when;
tmp->variable = variable;
tmp->when = ast_tv(0, 0);
if (sched_settime(&tmp->when, when)) {
sched_release(con, tmp);
} else {
@@ -260,44 +255,41 @@ int ast_sched_add(struct sched_context *con, int when, ast_sched_cb callback, vo
*/
int ast_sched_del(struct sched_context *con, int id)
{
struct sched *last=NULL, *s;
struct sched *s;
DEBUG(ast_log(LOG_DEBUG, "ast_sched_del()\n"));
ast_mutex_lock(&con->lock);
s = con->schedq;
while(s) {
AST_LIST_TRAVERSE_SAFE_BEGIN(&con->schedq, s, list) {
if (s->id == id) {
if (last)
last->next = s->next;
else
con->schedq = s->next;
AST_LIST_REMOVE_CURRENT(&con->schedq, list);
con->schedcnt--;
sched_release(con, s);
break;
}
last = s;
s = s->next;
}
AST_LIST_TRAVERSE_SAFE_END
#ifdef DUMP_SCHEDULER
/* Dump contents of the context while we have the lock so nothing gets screwed up by accident. */
ast_sched_dump(con);
#endif
ast_mutex_unlock(&con->lock);
if (!s) {
ast_log(LOG_NOTICE, "Attempted to delete nonexistent schedule entry %d!\n", id);
#ifdef DO_CRASH
CRASH;
#endif
return -1;
} else
return 0;
}
return 0;
}
/*! \brief Dump the contents of the scheduler to stderr */
void ast_sched_dump(const struct sched_context *con)
{
/*
* Dump the contents of the scheduler to
* stderr
*/
struct sched *q;
struct timeval tv = ast_tvnow();
#ifdef SCHED_MAX_CACHE
@@ -309,7 +301,7 @@ void ast_sched_dump(const struct sched_context *con)
ast_log(LOG_DEBUG, "=============================================================\n");
ast_log(LOG_DEBUG, "|ID Callback Data Time (sec:ms) |\n");
ast_log(LOG_DEBUG, "+-----+-----------------+-----------------+-----------------+\n");
for (q = con->schedq; q; q = q->next) {
AST_LIST_TRAVERSE(&con->schedq, q, list) {
struct timeval delta = ast_tvsub(q->when, tv);
ast_log(LOG_DEBUG, "|%.4d | %-15p | %-15p | %.6ld : %.6ld |\n",
@@ -336,7 +328,7 @@ int ast_sched_runq(struct sched_context *con)
ast_mutex_lock(&con->lock);
for(;;) {
if (!con->schedq)
if (AST_LIST_EMPTY(&con->schedq))
break;
/* schedule all events which are going to expire within 1ms.
@@ -345,9 +337,8 @@ int ast_sched_runq(struct sched_context *con)
* close together.
*/
tv = ast_tvadd(ast_tvnow(), ast_tv(0, 1000));
if (SOONER(con->schedq->when, tv)) {
current = con->schedq;
con->schedq = con->schedq->next;
if (SOONER(AST_LIST_FIRST(&con->schedq)->when, tv)) {
current = AST_LIST_REMOVE_HEAD(&con->schedq, list);
con->schedcnt--;
/*
@@ -391,15 +382,16 @@ long ast_sched_when(struct sched_context *con,int id)
DEBUG(ast_log(LOG_DEBUG, "ast_sched_when()\n"));
ast_mutex_lock(&con->lock);
for (s = con->schedq; s; s = s->next) {
AST_LIST_TRAVERSE(&con->schedq, s, list) {
if (s->id == id)
break;
}
secs=-1;
if (s!=NULL) {
secs = -1;
if (s) {
struct timeval now = ast_tvnow();
secs = s->when.tv_sec - now.tv_sec;
}
ast_mutex_unlock(&con->lock);
return secs;
}