修复签章浮动靠左问题

mysql/include/thr_cond.h

@@ -0,0 +1,208 @@
+#ifndef THR_COND_INCLUDED
+#define THR_COND_INCLUDED
+
+/* Copyright (c) 2014, 2023, Oracle and/or its affiliates.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License, version 2.0,
+   as published by the Free Software Foundation.
+
+   This program is also distributed with certain software (including
+   but not limited to OpenSSL) that is licensed under separate terms,
+   as designated in a particular file or component or in included license
+   documentation.  The authors of MySQL hereby grant you an additional
+   permission to link the program and your derivative works with the
+   separately licensed software that they have included with MySQL.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License, version 2.0, for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+/**
+  MySQL condition variable implementation.
+
+  There are three "layers":
+  1) native_cond_*()
+       Functions that map directly down to OS primitives.
+       Windows    - ConditionVariable
+       Other OSes - pthread
+  2) my_cond_*()
+       Functions that use SAFE_MUTEX (default for debug).
+       Otherwise native_cond_*() is used.
+  3) mysql_cond*()
+       Functions that include Performance Schema instrumentation.
+       See include/mysql/psi/mysql_thread.h
+*/
+
+#include "my_thread.h"
+#include "thr_mutex.h"
+
+C_MODE_START
+
+#ifdef _WIN32
+typedef CONDITION_VARIABLE native_cond_t;
+#else
+typedef pthread_cond_t native_cond_t;
+#endif
+
+#ifdef _WIN32
+/**
+  Convert abstime to milliseconds
+*/
+
+static DWORD get_milliseconds(const struct timespec *abstime)
+{
+#ifndef HAVE_STRUCT_TIMESPEC
+  long long millis;
+  union ft64 now;
+
+  if (abstime == NULL)
+   return INFINITE;
+
+  GetSystemTimeAsFileTime(&now.ft);
+
+  /*
+    Calculate time left to abstime
+    - subtract start time from current time(values are in 100ns units)
+    - convert to millisec by dividing with 10000
+  */
+  millis= (abstime->tv.i64 - now.i64) / 10000;
+
+  /* Don't allow the timeout to be negative */
+  if (millis < 0)
+    return 0;
+
+  /*
+    Make sure the calculated timeout does not exceed original timeout
+    value which could cause "wait for ever" if system time changes
+  */
+  if (millis > abstime->max_timeout_msec)
+    millis= abstime->max_timeout_msec;
+
+  if (millis > UINT_MAX)
+    millis= UINT_MAX;
+
+  return (DWORD)millis;
+#else
+  /*
+    Convert timespec to millis and subtract current time.
+    my_getsystime() returns time in 100 ns units.
+  */
+  ulonglong future= abstime->tv_sec * 1000 + abstime->tv_nsec / 1000000;
+  ulonglong now= my_getsystime() / 10000;
+  /* Don't allow the timeout to be negative. */
+  if (future < now)
+    return 0;
+  return (DWORD)(future - now);
+#endif
+}
+#endif /* _WIN32 */
+
+static inline int native_cond_init(native_cond_t *cond)
+{
+#ifdef _WIN32
+  InitializeConditionVariable(cond);
+  return 0;
+#else
+  /* pthread_condattr_t is not used in MySQL */
+  return pthread_cond_init(cond, NULL);
+#endif
+}
+
+static inline int native_cond_destroy(native_cond_t *cond)
+{
+#ifdef _WIN32
+  return 0; /* no destroy function */
+#else
+  return pthread_cond_destroy(cond);
+#endif
+}
+
+static inline int native_cond_timedwait(native_cond_t *cond,
+                                        native_mutex_t *mutex,
+                                        const struct timespec *abstime)
+{
+#ifdef _WIN32
+  DWORD timeout= get_milliseconds(abstime);
+  if (!SleepConditionVariableCS(cond, mutex, timeout))
+    return ETIMEDOUT;
+  return 0;
+#else
+  return pthread_cond_timedwait(cond, mutex, abstime);
+#endif
+}
+
+static inline int native_cond_wait(native_cond_t *cond, native_mutex_t *mutex)
+{
+#ifdef _WIN32
+  if (!SleepConditionVariableCS(cond, mutex, INFINITE))
+    return ETIMEDOUT;
+  return 0;
+#else
+  return pthread_cond_wait(cond, mutex);
+#endif
+}
+
+static inline int native_cond_signal(native_cond_t *cond)
+{
+#ifdef _WIN32
+  WakeConditionVariable(cond);
+  return 0;
+#else
+  return pthread_cond_signal(cond);
+#endif
+}
+
+static inline int native_cond_broadcast(native_cond_t *cond)
+{
+#ifdef _WIN32
+  WakeAllConditionVariable(cond);
+  return 0;
+#else
+  return pthread_cond_broadcast(cond);
+#endif
+}
+
+#ifdef SAFE_MUTEX
+int safe_cond_wait(native_cond_t *cond, my_mutex_t *mp,
+                   const char *file, uint line);
+int safe_cond_timedwait(native_cond_t *cond, my_mutex_t *mp,
+                        const struct timespec *abstime,
+                        const char *file, uint line);
+#endif
+
+static inline int my_cond_timedwait(native_cond_t *cond, my_mutex_t *mp,
+                                    const struct timespec *abstime
+#ifdef SAFE_MUTEX
+                                    , const char *file, uint line
+#endif
+                                    )
+{
+#ifdef SAFE_MUTEX
+  return safe_cond_timedwait(cond, mp, abstime, file, line);
+#else
+  return native_cond_timedwait(cond, mp, abstime);
+#endif
+}
+
+static inline int my_cond_wait(native_cond_t *cond, my_mutex_t *mp
+#ifdef SAFE_MUTEX
+                               , const char *file, uint line
+#endif
+                               )
+{
+#ifdef SAFE_MUTEX
+  return safe_cond_wait(cond, mp, file, line);
+#else
+  return native_cond_wait(cond, mp);
+#endif
+}
+
+C_MODE_END
+
+#endif /* THR_COND_INCLUDED */