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/* 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 DRIZZLED_INTERNAL_MY_PTHREAD_H
#define DRIZZLED_INTERNAL_MY_PTHREAD_H
#include <unistd.h>
#include <signal.h>
#ifndef ETIME
#define ETIME ETIMEDOUT /* For FreeBSD */
#endif
#include <pthread.h>
#ifndef _REENTRANT
#define _REENTRANT
#endif
#ifdef HAVE_SCHED_H
#include <sched.h>
#endif
#ifdef HAVE_SYNCH_H
#include <synch.h>
#endif
namespace drizzled
{
namespace internal
{
#define pthread_key(T,V) pthread_key_t V
#define pthread_handler_t void *
typedef void *(* pthread_handler)(void *);
/*
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(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 */
#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
#ifndef ESRCH
/* Define it to something */
#define ESRCH 1
#endif
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 */
/*
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;
uint64_t 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 (::drizzled::internal::_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)
} /* namespace internal */
} /* namespace drizzled */
#endif /* DRIZZLED_INTERNAL_MY_PTHREAD_H */
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