support posix

1. posix pthread.h: pthread, pthread_barrier, pthread_cond, pthread_mutex, , pthread_rwlock, pthread_spin, etc
2. posix semaphore.h: sem_*
3. posix mqueue.h: mq_*
4. posix time.h: timer_*
5. to support posix, add tos_barrier, tos_bitmap, tos_rwlock, tos_stopwatch, change name of k_task_t from a char * pointer to a char array.
6. sample, see examples\posix
7. project, see board\TencentOS_tiny_EVB_MX_Plus\KEIL\posix

osal/posix/include/sys/time.h

@@ -0,0 +1,62 @@
+/*----------------------------------------------------------------------------
+ * Tencent is pleased to support the open source community by making TencentOS
+ * available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ * If you have downloaded a copy of the TencentOS binary from Tencent, please
+ * note that the TencentOS binary is licensed under the BSD 3-Clause License.
+ *
+ * If you have downloaded a copy of the TencentOS source code from Tencent,
+ * please note that TencentOS source code is licensed under the BSD 3-Clause
+ * License, except for the third-party components listed below which are
+ * subject to different license terms. Your integration of TencentOS into your
+ * own projects may require compliance with the BSD 3-Clause License, as well
+ * as the other licenses applicable to the third-party components included
+ * within TencentOS.
+ *---------------------------------------------------------------------------*/
+
+#ifndef _POSIX_SYS_TIME_H_
+#define  _POSIX_SYS_TIME_H_
+
+#include "sys/types.h"
+#include "time.h"
+
+__CDECLS_BEGIN
+
+struct timeval {
+    long    tv_sec;
+    long    tv_usec;
+};
+
+struct itimerval {
+    struct timeval  it_interval;    /* timer interval */
+    struct timeval  it_value;       /* current value */
+};
+
+#define TIMEVAL_TO_TIMESPEC(tv, ts) {                   \
+    (ts)->tv_sec = (tv)->tv_sec;                        \
+    (ts)->tv_nsec = (tv)->tv_usec * 1000;               \
+}
+
+#define TIMESPEC_TO_TIMEVAL(tv, ts) {                   \
+    (tv)->tv_sec = (ts)->tv_sec;                        \
+    (tv)->tv_usec = (ts)->tv_nsec / 1000;               \
+}
+
+struct timezone {
+    int     tz_minuteswest;     /* minutes west of Greenwich */
+    int     tz_dsttime;         /* type of dst correction */
+};
+
+__API__ int getitimer(int which, struct itimerval *value);
+__API__ int gettimeofday(struct timeval *tp, void *tzp);
+__API__ int setitimer(int which, const struct itimerval *value, struct itimerval *ovalue);
+#if 0
+int   select(int, fd_set *restrict, fd_set *restrict, fd_set *restrict, struct timeval *restrict);
+#endif
+__API__ int utimes(const char *path, const struct timeval [2]);
+
+__CDECLS_END
+
+#endif /* _POSIX_SYS_TIME_H_ */
+