[PATCH 3/9] wrapper: add sleep_nanosec
Signed-off-by: Siddh Raman Pant <siddh.raman.pant@oracle.com>
---
wrapper.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
wrapper.h | 1 +
2 files changed, 50 insertions(+)
diff --git a/wrapper.c b/wrapper.c
index 16f5a63fbb61..1349255f1eb4 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -10,6 +10,7 @@
#include "gettext.h"
#include "strbuf.h"
#include "trace2.h"
+#include <time.h>
#ifdef HAVE_RTLGENRANDOM
/* This is required to get access to RtlGenRandom. */
@@ -708,6 +709,54 @@ void sleep_millisec(int millisec)
poll(NULL, 0, millisec);
}
+#ifdef GIT_WINDOWS_NATIVE
+/* No nanosleep() on Windows, so fall-back to using sleep_millisec(). */
+int sleep_nanosec(uint64_t nanosec)
+{
+ uint64_t ns_in_1ms = 1000000ULL; /* 1 ms = 10^6 ns */
+
+ uint64_t millisec = nanosec / ns_in_1ms;
+ if (nanosec % ns_in_1ms)
+ millisec++;
+
+ /* Chunked sleep if we can't represent in integer. */
+ while (millisec > INT_MAX) {
+ sleep_millisec(INT_MAX);
+ millisec -= INT_MAX;
+ }
+
+ sleep_millisec((int)millisec);
+
+ return 0;
+}
+#else
+/* Not Windows, so use the more exact nanosleep(). */
+int sleep_nanosec(uint64_t nanosec)
+{
+ int ret;
+ struct timespec duration, remaining;
+
+ /* Construct the duration by dividing the given total (1s = 10^9ns). */
+ duration.tv_sec = nanosec / 1000000000ULL;
+ duration.tv_nsec = nanosec % 1000000000ULL;
+
+ while(1) {
+ ret = nanosleep(&duration, &remaining);
+
+ /* Continue sleeping if interrupted. */
+ if (ret == -1 && errno == EINTR) {
+ duration = remaining;
+ continue;
+ }
+
+ /* Either success or an error. */
+ break;
+ }
+
+ return ret;
+}
+#endif /* GIT_WINDOWS_NATIVE */
+
int xgethostname(char *buf, size_t len)
{
/*
diff --git a/wrapper.h b/wrapper.h
index 15ac3bab6e97..c39992893a81 100644
--- a/wrapper.h
+++ b/wrapper.h
@@ -130,6 +130,7 @@ int warn_on_fopen_errors(const char *path);
int open_nofollow(const char *path, int flags);
void sleep_millisec(int millisec);
+int sleep_nanosec(uint64_t nanosec);
enum {
/*
--
2.53.0
Siddh Raman Pant <siddh.raman.pant@oracle.com>