1 files changed, 89 insertions, 0 deletions
diff --git a/pcilib/timing.c b/pcilib/timing.c
new file mode 100644
index 0000000..0632b08
--- /dev/null
+++ b/pcilib/timing.c
@@ -0,0 +1,89 @@
+#define _POSIX_C_SOURCE 200112L
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <assert.h>
+#include <ctype.h>
+#include <time.h>
+#include <sched.h>
+#include <arpa/inet.h>
+#include <sys/time.h>
+
+#include "pci.h"
+#include "tools.h"
+#include "error.h"
+
+int pcilib_add_timeout(struct timeval *tv, pcilib_timeout_t timeout) {
+    tv->tv_usec += timeout%1000000;
+    if (tv->tv_usec > 999999) {
+	tv->tv_usec -= 1000000;
+	tv->tv_sec += 1 + timeout/1000000;
+    } else {
+	tv->tv_sec += timeout/1000000;
+    }
+
+    return 0;
+}
+
+int pcilib_calc_deadline(struct timeval *tv, pcilib_timeout_t timeout) {
+    gettimeofday(tv, NULL);
+    pcilib_add_timeout(tv, timeout);
+
+    return 0;
+}
+
+int pcilib_check_deadline(struct timeval *tve, pcilib_timeout_t timeout) {
+    int64_t res;
+    struct timeval tvs;
+
+    if (!tve->tv_sec) return 0;
+
+    gettimeofday(&tvs, NULL);
+    res = ((tve->tv_sec - tvs.tv_sec)*1000000 + (tve->tv_usec - tvs.tv_usec));
+	// Hm... Some problems comparing signed and unsigned. So, sign check first
+    if ((res < 0)||(res < timeout)) {
+	return 1;
+    }
+
+    return 0;
+}
+
+pcilib_timeout_t pcilib_calc_time_to_deadline(struct timeval *tve) {
+    int64_t res;
+    struct timeval tvs;
+    
+    gettimeofday(&tvs, NULL);
+    res = ((tve->tv_sec - tvs.tv_sec)*1000000 + (tve->tv_usec - tvs.tv_usec));
+    
+    if (res < 0) return 0;
+    return res;
+}
+
+int pcilib_sleep_until_deadline(struct timeval *tv) {
+    struct timespec wait;
+    pcilib_timeout_t duration;
+
+    duration = pcilib_calc_time_to_deadline(tv);
+    if (duration > 0) {
+	wait.tv_sec = duration / 1000000;
+	wait.tv_nsec = 1000 * (duration % 1000000);
+	nanosleep(&wait, NULL);
+    }
+
+    return 0;
+}
+
+pcilib_timeout_t pcilib_timediff(struct timeval *tvs, struct timeval *tve) {
+    return ((tve->tv_sec - tvs->tv_sec)*1000000 + (tve->tv_usec - tvs->tv_usec));
+}
+
+int pcilib_timecmp(struct timeval *tv1, struct timeval *tv2) {
+    if (tv1->tv_sec > tv2->tv_sec) return 1;
+    else if (tv1->tv_sec < tv2->tv_sec) return -1;
+    else if (tv1->tv_usec > tv2->tv_usec) return 1;
+    else if (tv1->tv_usec < tv2->tv_usec) return -1;
+    return 0;
+}