~drizzle-trunk/drizzle/development

/* Copyright (C) 2000 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   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 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/* Defines to make different thread packages compatible */

#ifndef _my_pthread_h
#define _my_pthread_h

#include <stdint.h>
#include <unistd.h>
#include <signal.h>

#ifndef ETIME
#define ETIME ETIMEDOUT				/* For FreeBSD */
#endif

#ifdef  __cplusplus
#define EXTERNC extern "C"
extern "C" {
#else
#define EXTERNC
#endif /* __cplusplus */

#include <pthread.h>
#ifndef _REENTRANT
#define _REENTRANT
#endif
#ifdef HAVE_SCHED_H
#include <sched.h>
#endif
#ifdef HAVE_SYNCH_H
#include <synch.h>
#endif

#define pthread_key(T,V) pthread_key_t V
#define pthread_handler_t void *
typedef void *(* pthread_handler)(void *);

#if defined(HAVE_SIGTHREADMASK) && !defined(HAVE_PTHREAD_SIGMASK)
#define pthread_sigmask(A,B,C) sigthreadmask((A),(B),(C))
#endif


/*
  We define my_sigset() and use that instead of the system sigset() so that
  we can favor an implementation based on sigaction(). On some systems, such
  as Mac OS X, sigset() results in flags such as SA_RESTART being set, and
  we want to make sure that no such flags are set.
*/
#if defined(HAVE_SIGACTION) && !defined(my_sigset)
#define my_sigset(A,B) do { struct sigaction l_s; sigset_t l_set; int l_rc; \
                            assert((A) != 0);                          \
                            sigemptyset(&l_set);                            \
                            l_s.sa_handler = (B);                           \
                            l_s.sa_mask   = l_set;                          \
                            l_s.sa_flags   = 0;                             \
                            l_rc= sigaction((A), &l_s, (struct sigaction *) NULL);\
                            assert(l_rc == 0);                         \
                          } while (0)
#elif defined(HAVE_SIGSET) && !defined(my_sigset)
#define my_sigset(A,B) sigset((A),(B))
#elif !defined(my_sigset)
#define my_sigset(A,B) signal((A),(B))
#endif

#ifndef my_pthread_attr_setprio
#ifdef HAVE_PTHREAD_ATTR_SETPRIO
#define my_pthread_attr_setprio(A,B) pthread_attr_setprio((A),(B))
#else
extern void my_pthread_attr_setprio(pthread_attr_t *attr, int priority);
#endif
#endif

#if !defined(HAVE_PTHREAD_YIELD_ONE_ARG) && !defined(HAVE_PTHREAD_YIELD_ZERO_ARG)
/* no pthread_yield() available */
#ifdef HAVE_SCHED_YIELD
#define pthread_yield() sched_yield()
#elif defined(HAVE_PTHREAD_YIELD_NP) /* can be Mac OS X */
#define pthread_yield() pthread_yield_np()
#endif
#endif

/*
  The defines set_timespec and set_timespec_nsec should be used
  for calculating an absolute time at which
  pthread_cond_timedwait should timeout
*/
#ifndef set_timespec
#define set_timespec(ABSTIME,SEC) \
{\
  struct timeval tv;\
  gettimeofday(&tv,0);\
  (ABSTIME).tv_sec=tv.tv_sec+(time_t) (SEC);\
  (ABSTIME).tv_nsec=tv.tv_usec*1000;\
}
#endif /* !set_timespec */
#ifndef set_timespec_nsec
#define set_timespec_nsec(ABSTIME,NSEC) \
{\
  uint64_t now= my_getsystime() + (NSEC/100); \
  (ABSTIME).tv_sec=  (time_t) (now / 10000000UL);                  \
  (ABSTIME).tv_nsec= (long) (now % 10000000UL * 100 + ((NSEC) % 100)); \
}
#endif /* !set_timespec_nsec */

	/* safe_mutex adds checking to mutex for easier debugging */

typedef struct st_safe_mutex_t
{
  pthread_mutex_t global,mutex;
  const char *file;
  uint32_t line,count;
  pthread_t thread;
} safe_mutex_t;

int safe_mutex_init(safe_mutex_t *mp, const pthread_mutexattr_t *attr,
                    const char *file, uint32_t line);
int safe_mutex_lock(safe_mutex_t *mp, bool try_lock, const char *file, uint32_t line);
int safe_mutex_unlock(safe_mutex_t *mp,const char *file, uint32_t line);
int safe_mutex_destroy(safe_mutex_t *mp,const char *file, uint32_t line);
int safe_cond_wait(pthread_cond_t *cond, safe_mutex_t *mp,const char *file,
		   uint32_t line);
int safe_cond_timedwait(pthread_cond_t *cond, safe_mutex_t *mp,
			struct timespec *abstime, const char *file, uint32_t line);
void safe_mutex_global_init(void);
void safe_mutex_end(void);

	/* Wrappers if safe mutex is actually used */
#define safe_mutex_assert_owner(mp)
#define safe_mutex_assert_not_owner(mp)

	/* READ-WRITE thread locking */

#ifndef HAVE_THR_SETCONCURRENCY
#define thr_setconcurrency(A) pthread_dummy(0)
#endif
#if !defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE) && ! defined(pthread_attr_setstacksize)
#define pthread_attr_setstacksize(A,B) pthread_dummy(0)
#endif

/* Define mutex types, see my_thr_init.c */
#ifdef THREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
extern pthread_mutexattr_t my_fast_mutexattr;
#define MY_MUTEX_INIT_FAST &my_fast_mutexattr
#else
#define MY_MUTEX_INIT_FAST   NULL
#endif
#ifdef PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
extern pthread_mutexattr_t my_errorcheck_mutexattr;
#define MY_MUTEX_INIT_ERRCHK &my_errorcheck_mutexattr
#else
#define MY_MUTEX_INIT_ERRCHK   NULL
#endif

#ifndef ESRCH
/* Define it to something */
#define ESRCH 1
#endif

typedef uint64_t my_thread_id;

extern bool my_thread_global_init(void);
extern void my_thread_global_end(void);
extern bool my_thread_init(void);
extern void my_thread_end(void);
extern const char *my_thread_name(void);

/* All thread specific variables are in the following struct */

#define THREAD_NAME_SIZE 10
/*
  Drizzle can survive with 32K, but some glibc libraries require > 128K stack
  to resolve hostnames. Also recursive stored procedures needs stack.
*/
#define DEFAULT_THREAD_STACK	(256*INT32_C(1024))

struct st_my_thread_var
{
  pthread_cond_t suspend;
  pthread_mutex_t mutex;
  pthread_mutex_t * volatile current_mutex;
  pthread_cond_t * volatile current_cond;
  pthread_t pthread_self;
  my_thread_id id;
  int volatile abort;
  bool init;
  struct st_my_thread_var *next,**prev;
  void *opt_info;
};

extern struct st_my_thread_var *_my_thread_var(void);
#define my_thread_var (_my_thread_var())
/*
  Keep track of shutdown,signal, and main threads so that my_end() will not
  report errors with them
*/

/* Which kind of thread library is in use */

#define THD_LIB_OTHER 1
#define THD_LIB_NPTL  2
#define THD_LIB_LT    4

extern uint32_t thd_lib_detected;

/*
  thread_safe_xxx functions are for critical statistic or counters.
  The implementation is guaranteed to be thread safe, on all platforms.
  Note that the calling code should *not* assume the counter is protected
  by the mutex given, as the implementation of these helpers may change
  to use my_atomic operations instead.
*/

#ifndef thread_safe_increment
#define thread_safe_increment(V,L) \
        (pthread_mutex_lock((L)), (V)++, pthread_mutex_unlock((L)))
#define thread_safe_decrement(V,L) \
        (pthread_mutex_lock((L)), (V)--, pthread_mutex_unlock((L)))
#endif

#ifndef thread_safe_add
#define thread_safe_add(V,C,L) \
        (pthread_mutex_lock((L)), (V)+=(C), pthread_mutex_unlock((L)))
#define thread_safe_sub(V,C,L) \
        (pthread_mutex_lock((L)), (V)-=(C), pthread_mutex_unlock((L)))
#endif

/*
  statistics_xxx functions are for non critical statistic,
  maintained in global variables.
  - race conditions can occur, making the result slightly inaccurate.
  - the lock given is not honored.
*/
#define statistic_decrement(V,L) (V)--
#define statistic_increment(V,L) (V)++
#define statistic_add(V,C,L)     (V)+=(C)
#define statistic_sub(V,C,L)     (V)-=(C)

/*
  No locking needed, the counter is owned by the thread
*/
#define status_var_increment(V) (V)++
#define status_var_decrement(V) (V)--
#define status_var_add(V,C)     (V)+=(C)
#define status_var_sub(V,C)     (V)-=(C)

#ifdef  __cplusplus
}
#endif
#endif /* _my_ptread_h */