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-rw-r--r--jwxyz/jwxyz-timers.c357
1 files changed, 357 insertions, 0 deletions
diff --git a/jwxyz/jwxyz-timers.c b/jwxyz/jwxyz-timers.c
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--- /dev/null
+++ b/jwxyz/jwxyz-timers.c
@@ -0,0 +1,357 @@
+/* xscreensaver, Copyright (c) 2006-2017 Jamie Zawinski <jwz@jwz.org>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation. No representations are made about the suitability of this
+ * software for any purpose. It is provided "as is" without express or
+ * implied warranty.
+ */
+
+/* This is the portable implementation of Xt timers and inputs, for libjwxyz.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifdef HAVE_JWXYZ /* whole file */
+
+
+#undef DEBUG_TIMERS
+#undef DEBUG_SOURCES
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/select.h>
+#include "jwxyz.h"
+#include "jwxyz-timers.h"
+
+#ifdef HAVE_ANDROID
+extern void Log(const char *format, ...);
+#endif
+
+#ifdef HAVE_COCOA
+# define Log(S, ...) fprintf(stderr, "xscreensaver: " S "\n", __VA_ARGS__)
+#endif
+
+#ifdef DEBUG_TIMERS
+# define LOGT(...) Log(__VA_ARGS__)
+#else
+# define LOGT(...)
+#endif
+
+#ifdef DEBUG_SOURCES
+# define LOGI(...) Log(__VA_ARGS__)
+#else
+# define LOGI(...)
+#endif
+
+#define ASSERT_RET(C,S) do { \
+ if (!(C)) { \
+ jwxyz_abort ("jwxyz-timers: %s",(S)); \
+ return; \
+ }} while(0)
+
+#define ASSERT_RET0(C,S) do { \
+ if (!(C)) { \
+ jwxyz_abort ("jwxyz-timers: %s",(S)); \
+ return 0; \
+ }} while(0)
+
+
+XtAppContext
+XtDisplayToApplicationContext (Display *dpy)
+{
+ return (XtAppContext) dpy;
+}
+
+#define app_to_display(APP) ((Display *) (APP))
+
+#define DISPLAY_SOURCES_DATA(APP) \
+ JWXYZ_VTBL(app_to_display (APP))->display_sources_data (app_to_display (APP))
+
+
+struct jwxyz_sources_data {
+ int fd_count;
+ XtInputId ids[FD_SETSIZE];
+ XtIntervalId all_timers;
+};
+
+struct jwxyz_XtIntervalId {
+ XtAppContext app;
+ int refcount;
+
+ double run_at;
+ XtTimerCallbackProc cb;
+ XtPointer closure;
+
+ XtIntervalId next;
+};
+
+struct jwxyz_XtInputId {
+ XtAppContext app;
+ int refcount;
+
+ XtInputCallbackProc cb;
+ XtPointer closure;
+ int fd;
+};
+
+
+static double
+double_time (void)
+{
+ struct timeval now;
+# ifdef GETTIMEOFDAY_TWO_ARGS
+ struct timezone tzp;
+ gettimeofday(&now, &tzp);
+# else
+ gettimeofday(&now);
+# endif
+
+ return (now.tv_sec + ((double) now.tv_usec * 0.000001));
+}
+
+
+jwxyz_sources_data *
+jwxyz_sources_init (XtAppContext app)
+{
+ jwxyz_sources_data *td = (jwxyz_sources_data *) calloc (1, sizeof (*td));
+ return td;
+}
+
+XtIntervalId
+XtAppAddTimeOut (XtAppContext app, unsigned long msecs,
+ XtTimerCallbackProc cb, XtPointer closure)
+{
+ jwxyz_sources_data *td = DISPLAY_SOURCES_DATA (app);
+ XtIntervalId data = (XtIntervalId) calloc (1, sizeof(*data));
+ double now = double_time();
+ data->app = app;
+ data->cb = cb;
+ data->closure = closure;
+ data->refcount++;
+ data->run_at = now + (msecs / 1000.0);
+
+ data->next = td->all_timers;
+ td->all_timers = data;
+
+ LOGT("timer 0x%08lX: alloc %lu %.2f", (unsigned long) data, msecs,
+ data->run_at - now);
+
+ return data;
+}
+
+
+/* This is called both by the user to manually kill a timer,
+ and by the run loop after a timer has fired.
+ */
+void
+XtRemoveTimeOut (XtIntervalId data)
+{
+ jwxyz_sources_data *td = DISPLAY_SOURCES_DATA (data->app);
+
+ LOGT("timer 0x%08lX: remove", (unsigned long) data);
+ ASSERT_RET (data->refcount > 0, "already freed");
+
+ data->refcount--;
+ LOGT("timer 0x%08lX: release %d", (unsigned long) data, data->refcount);
+ ASSERT_RET (data->refcount >= 0, "double free");
+
+ if (data->refcount == 0) {
+
+ /* Remove it from the list of live timers. */
+ XtIntervalId prev, timer;
+ int hit = 0;
+ for (timer = td->all_timers, prev = 0;
+ timer;
+ prev = timer, timer = timer->next) {
+ if (timer == data) {
+ ASSERT_RET (!hit, "circular timer list");
+ if (prev)
+ prev->next = timer->next;
+ else
+ td->all_timers = timer->next;
+ timer->next = 0;
+ hit = 1;
+ } else {
+ ASSERT_RET (timer->refcount > 0, "timer list corrupted");
+ }
+ }
+
+ free (data);
+ }
+}
+
+
+XtInputId
+XtAppAddInput (XtAppContext app, int fd, XtPointer flags,
+ XtInputCallbackProc cb, XtPointer closure)
+{
+ jwxyz_sources_data *td = DISPLAY_SOURCES_DATA (app);
+ XtInputId data = (XtInputId) calloc (1, sizeof(*data));
+ data->cb = cb;
+ data->fd = fd;
+ data->closure = closure;
+ data->app = app;
+ data->refcount++;
+
+ LOGI("source 0x%08lX %2d: alloc", (unsigned long) data, data->fd);
+
+ ASSERT_RET0 (fd > 0 && fd < FD_SETSIZE, "fd out of range");
+ ASSERT_RET0 (td->ids[fd] == 0, "sources corrupted");
+ td->ids[fd] = data;
+ td->fd_count++;
+
+ return data;
+}
+
+
+void
+XtRemoveInput (XtInputId id)
+{
+ jwxyz_sources_data *td = DISPLAY_SOURCES_DATA (id->app);
+
+ LOGI("source 0x%08lX %2d: remove", (unsigned long) id, id->fd);
+ ASSERT_RET (id->refcount > 0, "sources corrupted");
+ ASSERT_RET (td->fd_count > 0, "sources corrupted");
+ ASSERT_RET (id->fd > 0 && id->fd < FD_SETSIZE, "fd out of range");
+ ASSERT_RET (td->ids[id->fd] == id, "sources corrupted");
+
+ td->ids[id->fd] = 0;
+ td->fd_count--;
+ id->refcount--;
+
+ LOGI("source 0x%08lX %2d: release %d", (unsigned long) id, id->fd,
+ id->refcount);
+ ASSERT_RET (id->refcount >= 0, "double free");
+ if (id->refcount == 0) {
+ memset (id, 0xA1, sizeof(*id));
+ id->fd = -666;
+ free (id);
+ }
+}
+
+
+static void
+jwxyz_timers_run (jwxyz_sources_data *td)
+{
+ /* Iterate the timer list, being careful because XtRemoveTimeOut removes
+ the current item from that list. */
+ if (td->all_timers) {
+ XtIntervalId timer, next;
+ double now = double_time();
+ int count = 0;
+
+ for (timer = td->all_timers, next = timer->next;
+ timer;
+ timer = next, next = (timer ? timer->next : 0)) {
+ if (timer->run_at <= now) {
+ LOGT("timer 0x%08lX: fire %.02f", (unsigned long) timer,
+ now - timer->run_at);
+ timer->cb (timer->closure, &timer);
+ XtRemoveTimeOut (timer);
+ count++;
+ ASSERT_RET (count < 10000, "way too many timers to run");
+ }
+ }
+ }
+}
+
+
+static void
+jwxyz_sources_run (jwxyz_sources_data *td)
+{
+ if (td->fd_count == 0) return;
+
+ struct timeval tv = { 0, };
+ fd_set fds;
+ int i;
+ int max = 0;
+
+ FD_ZERO (&fds);
+ for (i = 0; i < FD_SETSIZE; i++) {
+ if (td->ids[i]) {
+ FD_SET (i, &fds);
+ max = i;
+ }
+ }
+
+ ASSERT_RET (max > 0, "no fds");
+
+ if (0 < select (max+1, &fds, NULL, NULL, &tv)) {
+ for (i = 0; i < FD_SETSIZE; i++) {
+ if (FD_ISSET (i, &fds)) {
+ XtInputId id = td->ids[i];
+ ASSERT_RET (id && id->cb, "sources corrupted");
+ ASSERT_RET (id->fd == i, "sources corrupted");
+ id->cb (id->closure, &id->fd, &id);
+ }
+ }
+ }
+}
+
+
+static void
+jwxyz_XtRemoveInput_all (jwxyz_sources_data *td)
+{
+ int i;
+ for (i = 0; i < FD_SETSIZE; i++) {
+ XtInputId id = td->ids[i];
+ if (id) XtRemoveInput (id);
+ }
+}
+
+
+static void
+jwxyz_XtRemoveTimeOut_all (jwxyz_sources_data *td)
+{
+ XtIntervalId timer, next;
+ int count = 0;
+
+ /* Iterate the timer list, being careful because XtRemoveTimeOut removes
+ the current item from that list. */
+ if (td->all_timers) {
+ for (timer = td->all_timers, next = timer->next;
+ timer;
+ timer = next, next = (timer ? timer->next : 0)) {
+ XtRemoveTimeOut (timer);
+ count++;
+ ASSERT_RET (count < 10000, "way too many timers to free");
+ }
+ ASSERT_RET (!td->all_timers, "timer list didn't empty");
+ }
+}
+
+
+void
+jwxyz_sources_free (jwxyz_sources_data *td)
+{
+ jwxyz_XtRemoveInput_all (td);
+ jwxyz_XtRemoveTimeOut_all (td);
+ memset (td, 0xA1, sizeof(*td));
+ free (td);
+}
+
+
+XtInputMask
+XtAppPending (XtAppContext app)
+{
+ return XtIMAlternateInput; /* just always say yes */
+}
+
+void
+XtAppProcessEvent (XtAppContext app, XtInputMask mask)
+{
+ jwxyz_sources_data *td = DISPLAY_SOURCES_DATA (app);
+ if (mask & XtIMAlternateInput)
+ jwxyz_sources_run (td);
+ if (mask & XtIMTimer)
+ jwxyz_timers_run (td);
+}
+
+#endif /* HAVE_JWXYZ */
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