fix: 修改DoNanoSleep 以纳秒为单位

DoNanoSleep 接口以微秒为单位，纳秒级别的在转换成微秒时被整除为0，
导致转换成tick时为0，导致延时时触发yield，导致延时时间超大
Close #I3Z9DP

Signed-off-by: zhushengle <zhushengle@huawei.com>
Change-Id: Ib662fdc80707be6040b2bb06a1b457344bd48b30

kernel/base/core/los_sys.c

@@ -59,11 +59,11 @@ LITE_OS_SEC_TEXT_MINOR UINT32 LOS_Tick2MS(UINT32 tick)
     return ((UINT64)tick * OS_SYS_MS_PER_SECOND) / LOSCFG_BASE_CORE_TICK_PER_SECOND;
 }
 
-LITE_OS_SEC_TEXT_MINOR UINT32 OsUS2Tick(UINT64 microsec)
+LITE_OS_SEC_TEXT_MINOR UINT32 OsNS2Tick(UINT64 nanoseconds)
 {
-    const UINT32 usPerTick = OS_SYS_US_PER_SECOND / LOSCFG_BASE_CORE_TICK_PER_SECOND;
+    const UINT32 nsPerTick = OS_SYS_NS_PER_SECOND / LOSCFG_BASE_CORE_TICK_PER_SECOND;
 
-    UINT64 ticks = (microsec + usPerTick - 1) / usPerTick;
+    UINT64 ticks = (nanoseconds + nsPerTick - 1) / nsPerTick;
     if (ticks > OS_MAX_VALUE) {
         ticks = OS_MAX_VALUE;
     }

kernel/base/include/los_sys_pri.h

@@ -121,9 +121,9 @@ extern "C" {
 
 /**
  * @ingroup los_sys
- * Convert microseconds to Ticks.
+ * Convert nanoseconds to Ticks.
  */
-extern UINT32 OsUS2Tick(UINT64 microsec);
+extern UINT32 OsNS2Tick(UINT64 nanoseconds);
 
 #ifdef __cplusplus
 #if __cplusplus

kernel/base/ipc/los_futex.c

@@ -647,7 +647,7 @@ INT32 OsFutexWait(const UINT32 *userVaddr, UINT32 flags, UINT32 val, UINT32 absT
         return ret;
     }
     if (absTime != LOS_WAIT_FOREVER) {
-        timeOut = OsUS2Tick(absTime);
+        timeOut = OsNS2Tick((UINT64)absTime * OS_SYS_NS_PER_US);
     }
 
     return OsFutexWaitTask(userVaddr, flags, val, timeOut);