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| author | Thomas Haller <thaller@redhat.com> | 2017-02-09 21:04:51 +0000 |
|---|---|---|
| committer | android-build-merger <android-build-merger@google.com> | 2017-02-09 21:04:51 +0000 |
| commit | 45218277cd5e2d460018b2d4f17431549dbe7f3b (patch) | |
| tree | 9922cffc848a7bca0cfab6e98d31a044d5589415 | |
| parent | 605874c7813667e09282d83d861a9b76a0b2f769 (diff) | |
| parent | 920dc7f13dcfc9b1d2f770f8d5182b315dc197b2 (diff) | |
| download | libnl-45218277cd5e2d460018b2d4f17431549dbe7f3b.tar.gz | |
lib/utils.c: add mutex to get_psched_settings()
am: 920dc7f13d
Change-Id: I5d4d1c3223be9ba9636ffd1e735aec1f422aa74c
| -rw-r--r-- | lib/utils.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/lib/utils.c b/lib/utils.c index 70b5253d..7b44243c 100644 --- a/lib/utils.c +++ b/lib/utils.c @@ -408,13 +408,20 @@ static void get_psched_settings(void) char name[FILENAME_MAX]; FILE *fd; int got_hz = 0; - static int initialized = 0; - if (initialized == 1) { + static volatile int initialized = 0; + const char *ev; + NL_LOCK(mutex); + + if (initialized == 1) return; - } - if (getenv("HZ")) { - long hz = strtol(getenv("HZ"), NULL, 0); + nl_lock(&mutex); + + if (initialized == 1) + return; + + if ((ev = getenv("HZ"))) { + long hz = strtol(ev, NULL, 0); if (LONG_MIN != hz && LONG_MAX != hz) { user_hz = hz; @@ -427,16 +434,15 @@ static void get_psched_settings(void) psched_hz = user_hz; - if (getenv("TICKS_PER_USEC")) { - double t = strtod(getenv("TICKS_PER_USEC"), NULL); + if ((ev = getenv("TICKS_PER_USEC"))) { + double t = strtod(ev, NULL); ticks_per_usec = t; } else { - if (getenv("PROC_NET_PSCHED")) - snprintf(name, sizeof(name), "%s", getenv("PROC_NET_PSCHED")); - else if (getenv("PROC_ROOT")) - snprintf(name, sizeof(name), "%s/net/psched", - getenv("PROC_ROOT")); + if ((ev = getenv("PROC_NET_PSCHED"))) + snprintf(name, sizeof(name), "%s", ev); + else if ((ev = getenv("PROC_ROOT"))) + snprintf(name, sizeof(name), "%s/net/psched", ev); else strncpy(name, "/proc/net/psched", sizeof(name) - 1); @@ -461,6 +467,8 @@ static void get_psched_settings(void) } } initialized = 1; + + nl_unlock(&mutex); } |