--- /dev/null
+/*
+ * clockapi.h
+ *
+ * Private header, declaring the common elements of the POSIX clock API.
+ *
+ * $Id$
+ *
+ * Written by Keith Marshall <keithmarshall@users.sourceforge.net>
+ * Copyright (C) 2017, 2018, MinGW.org Project
+ *
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+#include <time.h>
+#include <stdint.h>
+#include <winbase.h>
+#include <errno.h>
+
+typedef enum
+{ /* The categories of clock, for which we provide support.
+ */
+ CLOCK_TYPE_REALTIME, /* CLOCK_REALTIME and derivatives */
+ CLOCK_TYPE_MONOTONIC, /* CLOCK_MONOTONIC and derivatives */
+
+ /* Only the above represent valid clock categories; we end the
+ * enumeration with this comparator reference value, to which,
+ * when compared as unsigned, all unsupported category values
+ * will be equal or greater.
+ */
+ CLOCK_TYPE_UNIMPLEMENTED
+} CLOCK_TYPE;
+
+/* POSIX specifies that CLOCK_REALTIME shall report time elapsed, in
+ * seconds and nanoseconds, since the start of the Unix epoch, (i.e.
+ * since 1970-01-01 00:00:00), but we count it, in 100ns increments,
+ * since the start of the Windows FILETIME epoch, (1601-01-01 00:00).
+ * The following manifest constants facilitate the conversion from
+ * Windows FILETIME to Unix epoch; (11644473600LL seconds of the
+ * Windows FILETIME epoch have elapsed, when the Unix epoch begins).
+ */
+#define NANOSECONDS_PER_SECOND 1000000000LL
+#define CLOCK_REALTIME_FREQUENCY (NANOSECONDS_PER_SECOND / 100LL)
+#define UNIX_EPOCH_AS_FILETIME (11644473600LL * CLOCK_REALTIME_FREQUENCY)
+
+typedef struct __attribute__((__aligned__(4))) __clockid__
+{ /* Formal definition of the clockid_t structure; (opaque to
+ * user application code).
+ */
+ CLOCK_TYPE type;
+ int64_t frequency;
+ int64_t resolution;
+ int64_t timebase;
+} *clockid_t;
+
+/* Prototype for clockid_t validation function; considered private
+ * within the scope of the implementation, (so not declared publicly),
+ * this also provides initialization support.
+ */
+extern clockid_t __clock_api_is_valid( clockid_t );
+
+#define CLOCK_INLINE static __inline__ __attribute__((__always_inline__))
+
+CLOCK_INLINE
+int clock_api_invalid_error( void )
+{ /* Inline helper function, to facilitate return from any of the
+ * standard clock API functions, while setting both "errno", and
+ * the return status, to report an invalid operation.
+ */
+ errno = EINVAL; return -1;
+}
+
+/* $RCSfile$: end of file */
OSDN Git Service
