Part of fs timers library, forgot to add this in previous commit.

diff --git a/servers/fs/timers.c b/servers/fs/timers.c
new file mode 100644 (file)
index 0000000..d3a9b36
--- /dev/null
+++ b/servers/fs/timers.c
@@ -0,0 +1,75 @@
+/* FS timers library
+ */
+
+#include "fs.h"
+#include "fs_timers.h"
+
+#define VERBOSE 1
+
+#include <timers.h>
+#include <minix/syslib.h>
+#include <minix/com.h>
+
+PRIVATE timer_t *fs_timers = NULL;
+
+PUBLIC void fs_set_timer(timer_t *tp, int ticks, tmr_func_t watchdog, int arg)
+{
+       int r;
+       clock_t now, old_head = 0, new_head;
+
+       if((r = sys_getuptime(&now)) != OK)
+               panic(__FILE__, "FS couldn't get uptime from system task.", NO_NUM);
+
+       tmr_inittimer(tp);
+       tmr_arg(tp)->ta_int = arg;
+
+       old_head = tmrs_settimer(&fs_timers, tp, now+ticks, watchdog, &new_head);
+
+       /* reschedule our synchronous alarm if necessary */
+       if(!old_head || old_head > new_head) {
+               if(sys_syncalrm(SELF, new_head, 1) != OK)
+                       panic(__FILE__, "FS set timer couldn't set synchronous alarm.", NO_NUM);
+#if VERBOSE
+               else
+                       printf("timers: after setting, set synalarm to %d -> %d\n", old_head, new_head);
+#endif
+       }
+
+       return;
+}
+
+PUBLIC void fs_expire_timers(clock_t now)
+{
+       clock_t new_head;
+       tmrs_exptimers(&fs_timers, now, &new_head);
+       if(new_head > 0) {
+               if(sys_syncalrm(SELF, new_head, 1) != OK)
+                       panic(__FILE__, "FS expire timer couldn't set synchronous alarm.", NO_NUM);
+               else
+#if VERBOSE
+                       printf("timers: after expiry, set synalarm to %d\n", new_head);
+#endif
+       }
+#if VERBOSE
+        else printf("after expiry, no new timer set\n");
+#endif
+}
+
+PUBLIC void fs_cancel_timer(timer_t *tp)
+{
+       clock_t new_head, old_head;
+       old_head = tmrs_clrtimer(&fs_timers, tp, &new_head);
+
+       /* if the earliest timer has been removed, we have to set
+        * the synalarm to the next timer, or cancel the synalarm
+        * altogether if th last time has been cancelled (new_head
+        * will be 0 then).
+        */
+       if(old_head < new_head || !new_head) {
+               if(sys_syncalrm(SELF, new_head, 1) != OK)
+                       panic(__FILE__, "FS expire timer couldn't set synchronous alarm.", NO_NUM);
+#if VERBOSE
+               printf("timers: after cancelling, set synalarm to %d -> %d\n", old_head, new_head);
+#endif
+       }
+}