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elinks/src/ecmascript/spidermonkey/heartbeat.c
أحمد المحمودي (Ahmed El-Mahmoudy) 887f85f6a9 Add signal.h to heartbeat,c includes
Build failed because hearbeat.c uses SIGVTALRM
2017-12-02 02:47:02 +01:00

128 lines
3.5 KiB
C

/* The SpiderMonkey ECMAScript backend heartbeat fuctionality. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/time.h> /* setitimer(2) */
#include <signal.h>
#include "elinks.h"
#include "ecmascript/spidermonkey/util.h"
#include "config/options.h"
#include "document/view.h"
#include "ecmascript/ecmascript.h"
#include "ecmascript/spidermonkey.h"
#include "ecmascript/spidermonkey/heartbeat.h"
#include "osdep/signals.h"
#include "session/session.h"
#include "util/lists.h"
#include "util/math.h" /* int_upper_bound */
#include "util/memory.h"
#include "viewer/text/vs.h"
static INIT_LIST_OF(struct heartbeat, heartbeats);
static struct itimerval heartbeat_timer = { { 1, 0 }, { 1, 0 } };
/* This callback is installed by JS_SetOperationCallback and triggered
* by JS_TriggerOperationCallback in the heartbeat code below. Returning
* JS_FALSE terminates script execution immediately. */
JSBool
heartbeat_callback(JSContext *ctx)
{
return JS_FALSE;
}
/* Callback for SIGVTALRM. Go through all heartbeats, decrease each
* one's TTL, and call JS_TriggerOperationCallback if a heartbeat's TTL
* goes to 0. */
static void
check_heartbeats(void *data)
{
struct heartbeat *hb;
foreach (hb, heartbeats) {
assert(hb->interpreter);
--hb->ttl;
if (hb->ttl <= 0) {
if (hb->interpreter->vs
&& hb->interpreter->vs->doc_view
&& hb->interpreter->vs->doc_view->session
&& hb->interpreter->vs->doc_view->session->tab
&& hb->interpreter->vs->doc_view->session->tab->term) {
struct session *ses = hb->interpreter->vs->doc_view->session;
struct terminal *term = ses->tab->term;
int max_exec_time = get_opt_int("ecmascript.max_exec_time", ses);
ecmascript_timeout_dialog(term, max_exec_time);
}
JS_TriggerOperationCallback(hb->interpreter->backend_data);
}
}
install_signal_handler(SIGVTALRM, check_heartbeats, NULL, 1);
}
/* Create a new heartbeat for the given interpreter. */
struct heartbeat *
add_heartbeat(struct ecmascript_interpreter *interpreter)
{
struct session *ses;
struct heartbeat *hb;
assert(interpreter);
if (!interpreter->vs || !interpreter->vs->doc_view)
ses = NULL;
else
ses = interpreter->vs->doc_view->session;
hb = mem_alloc(sizeof(struct heartbeat));
if (!hb) return NULL;
hb->ttl = get_opt_int("ecmascript.max_exec_time", ses);
hb->interpreter = interpreter;
add_to_list(heartbeats, hb);
/* Update the heartbeat timer. */
if (list_is_singleton(*hb)) {
heartbeat_timer.it_value.tv_sec = 1;
setitimer(ITIMER_VIRTUAL, &heartbeat_timer, NULL);
}
/* We install the handler every call to add_heartbeat instead of only on
* module initialisation because other code may set other handlers for
* the signal. */
install_signal_handler(SIGVTALRM, check_heartbeats, NULL, 1);
return hb;
}
/* Destroy the given heartbeat. */
void
done_heartbeat(struct heartbeat *hb)
{
if (!hb) return; /* add_heartbeat returned NULL */
assert(hb->interpreter);
/* Stop the heartbeat timer if this heartbeat is the only one. */
if (list_is_singleton(*hb)) {
heartbeat_timer.it_value.tv_sec = 0;
setitimer(ITIMER_VIRTUAL, &heartbeat_timer, NULL);
}
del_from_list(hb);
hb->interpreter->heartbeat = NULL;
mem_free(hb);
}