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implementation of a mutex lock to prevent appointment linked list from race conditions

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apoint_llist_init() created
This commit is contained in:
Frederic Culot 2006-09-12 14:57:06 +00:00
parent 40c9fa0882
commit 64b6d4bccf
1 changed files with 41 additions and 19 deletions
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60
src/apoint.c
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@ -1,4 +1,4 @@
/* $calcurse: apoint.c,v 1.2 2006/09/11 13:42:57 culot Exp $ */
/* $calcurse: apoint.c,v 1.3 2006/09/12 14:57:06 culot Exp $ */
/*
* Calcurse - text-based organizer
@ -39,29 +39,43 @@
#include "utils.h"
#include "notify.h"
struct apoint_s *apointlist;
apoint_llist_t *alist_p;
struct apoint_s *apoint_new(char *mesg, long start, long dur)
int apoint_llist_init(void)
{
struct apoint_s *o, **i;
o = (struct apoint_s *) malloc(sizeof(struct apoint_s));
alist_p = (apoint_llist_t *) malloc(sizeof(apoint_llist_t));
alist_p->root = NULL;
pthread_mutex_init(&(alist_p->mutex), NULL);
return 0;
}
apoint_llist_node_t *apoint_new(char *mesg, long start, long dur)
{
apoint_llist_node_t *o, **i;
o = (apoint_llist_node_t *) malloc(sizeof(apoint_llist_node_t));
o->mesg = (char *) malloc(strlen(mesg) + 1);
strcpy(o->mesg, mesg);
o->start = start;
o->dur = dur;
i = &apointlist;
pthread_mutex_lock(&(alist_p->mutex));
i = &alist_p->root;
for (;;) {
if (*i == 0 || (*i)->start > start) {
o->next = *i;
*i = o;
break;
}
}
i = &(*i)->next;
}
pthread_mutex_unlock(&(alist_p->mutex));
return o;
}
unsigned apoint_inday(struct apoint_s *i, long start)
unsigned apoint_inday(apoint_llist_node_t *i, long start)
{
if (i->start <= start + 3600 * 24 && i->start + i->dur > start) {
return 1;
@ -69,7 +83,8 @@ unsigned apoint_inday(struct apoint_s *i, long start)
return 0;
}
void apoint_sec2str(struct apoint_s *o, int type, long day, char *start, char *end)
void apoint_sec2str(apoint_llist_node_t *o,
int type, long day, char *start, char *end)
{
struct tm *lt;
time_t t;
@ -92,7 +107,7 @@ void apoint_sec2str(struct apoint_s *o, int type, long day, char *start, char *e
}
}
void apoint_write(struct apoint_s *o, FILE * f)
void apoint_write(apoint_llist_node_t *o, FILE * f)
{
struct tm *lt;
time_t t;
@ -110,7 +125,7 @@ void apoint_write(struct apoint_s *o, FILE * f)
lt->tm_hour, lt->tm_min, o->mesg);
}
struct apoint_s *apoint_scan(FILE * f, struct tm start, struct tm end)
apoint_llist_node_t *apoint_scan(FILE * f, struct tm start, struct tm end)
{
struct tm *lt;
char buf[MESG_MAXSIZE], *nl;
@ -145,22 +160,27 @@ struct apoint_s *apoint_scan(FILE * f, struct tm start, struct tm end)
void apoint_delete_bynum(long start, unsigned num)
{
unsigned n;
struct apoint_s *i, **iptr;
apoint_llist_node_t *i, **iptr;
n = 0;
iptr = &apointlist;
for (i = apointlist; i != 0; i = i->next) {
pthread_mutex_lock(&(alist_p->mutex));
iptr = &alist_p->root;
for (i = alist_p->root; i != 0; i = i->next) {
if (apoint_inday(i, start)) {
if (n == num) {
*iptr = i->next;
free(i->mesg);
free(i);
pthread_mutex_unlock(&(alist_p->mutex));
return;
}
n++;
}
iptr = &i->next;
}
pthread_mutex_unlock(&(alist_p->mutex));
/* NOTREACHED */
fputs(_("FATAL ERROR in apoint_delete_bynum: no such appointment\n"), stderr);
exit(EXIT_FAILURE);
@ -169,7 +189,7 @@ void apoint_delete_bynum(long start, unsigned num)
/*
* Print an item date in the appointment panel.
*/
void display_item_date(WINDOW *win, int incolor, struct apoint_s *i,
void display_item_date(WINDOW *win, int incolor, apoint_llist_node_t *i,
int type, long date, int y, int x)
{
char a_st[100], a_end[100];
@ -241,12 +261,12 @@ void scroll_pad_up(int item_nb, int nb_events_inday)
*/
struct notify_app_s *apoint_check_next(struct notify_app_s *app, long start)
{
struct apoint_s *i;
apoint_llist_node_t *i;
if (!apointlist)
return app;
for (i = apointlist; i != 0; i = i->next) {
pthread_mutex_lock(&(alist_p->mutex));
for (i = alist_p->root; i != 0; i = i->next) {
if (i->start > app->time) {
pthread_mutex_unlock(&(alist_p->mutex));
return app;
} else {
if (i->start > start) {
@ -262,5 +282,7 @@ struct notify_app_s *apoint_check_next(struct notify_app_s *app, long start)
}
}
}
pthread_mutex_unlock(&(alist_p->mutex));
return app;
}