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-rw-r--r--src/H5system.c112
1 files changed, 111 insertions, 1 deletions
diff --git a/src/H5system.c b/src/H5system.c
index f91fb27..4baebc5 100644
--- a/src/H5system.c
+++ b/src/H5system.c
@@ -587,6 +587,68 @@ void HDsrand(unsigned int seed)
#endif /* H5_HAVE_RAND_R */
+
+/*-------------------------------------------------------------------------
+ * Function: Pflock
+ *
+ * Purpose: Wrapper function for POSIX systems where flock(2) is not
+ * available.
+ *
+ * Return: Success: 0
+ * Failure: -1
+ *
+ *-------------------------------------------------------------------------
+ */
+/* NOTE: Compile this all the time on POSIX systems, even when flock(2) is
+ * present so that it's less likely to become dead code.
+ */
+#ifdef H5_HAVE_FCNTL
+int
+Pflock(int fd, int operation) {
+
+ struct flock flk;
+
+ /* Set the lock type */
+ if(operation & LOCK_UN)
+ flk.l_type = F_UNLCK;
+ else if(operation & LOCK_SH)
+ flk.l_type = F_RDLCK;
+ else
+ flk.l_type = F_WRLCK;
+
+ /* Set the other flock struct values */
+ flk.l_whence = SEEK_SET;
+ flk.l_start = 0;
+ flk.l_len = 0; /* to EOF */
+ flk.l_pid = 0; /* not used with set */
+
+ /* Lock or unlock */
+ if(HDfcntl(fd, F_SETLK, flk) < 0)
+ return -1;
+
+ return 0;
+
+} /* end Pflock() */
+#endif /* H5_HAVE_FCNTL */
+
+
+/*-------------------------------------------------------------------------
+ * Function: Nflock
+ *
+ * Purpose: Wrapper function for systems where no file locking is
+ * available.
+ *
+ * Return: Failure: -1 (always fails)
+ *
+ *-------------------------------------------------------------------------
+ */
+int H5_ATTR_CONST
+Nflock(int H5_ATTR_UNUSED fd, int H5_ATTR_UNUSED operation) {
+ /* just fail */
+ return -1;
+} /* end Nflock() */
+
+
/*-------------------------------------------------------------------------
* Function: H5_make_time
*
@@ -767,7 +829,55 @@ int c99_vsnprintf(char* str, size_t size, const char* format, va_list ap)
return count;
}
-#endif
+
+/*-------------------------------------------------------------------------
+ * Function: Wflock
+ *
+ * Purpose: Wrapper function for flock on Windows systems
+ *
+ * Return: Success: 0
+ * Failure: -1
+ *
+ *-------------------------------------------------------------------------
+ */
+int
+Wflock(int H5_ATTR_UNUSED fd, int H5_ATTR_UNUSED operation) {
+
+/* This is a no-op while we implement a Win32 VFD */
+#if 0
+int
+Wflock(int fd, int operation) {
+
+ HANDLE hFile;
+ DWORD dwFlags = LOCKFILE_FAIL_IMMEDIATELY;
+ DWORD dwReserved = 0;
+ /* MAXDWORD for entire file */
+ DWORD nNumberOfBytesToLockLow = MAXDWORD;
+ DWORD nNumberOfBytesToLockHigh = MAXDWORD;
+ /* Must initialize OVERLAPPED struct */
+ OVERLAPPED overlapped = {0};
+
+ /* Get Windows HANDLE */
+ hFile = _get_osfhandle(fd);
+
+ /* Convert to Windows flags */
+ if(operation & LOCK_EX)
+ dwFlags |= LOCKFILE_EXCLUSIVE_LOCK;
+
+ /* Lock or unlock */
+ if(operation & LOCK_UN)
+ if(0 == UnlockFileEx(hFile, dwReserved, nNumberOfBytesToLockLow,
+ nNumberOfBytesToLockHigh, &overlapped))
+ return -1;
+ else
+ if(0 == LockFileEx(hFile, dwFlags, dwReserved, nNumberOfBytesToLockLow,
+ nNumberOfBytesToLockHigh, &overlapped))
+ return -1;
+#endif /* 0 */
+ return 0;
+} /* end Wflock() */
+
+#endif /* H5_HAVE_VISUAL_STUDIO */
/*-------------------------------------------------------------------------