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Convert LOCK_global_system_variables to boost.

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drizzled/drizzled.cc
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#include <limits.h>
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#include <boost/program_options.hpp>
 
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#include <boost/thread/recursive_mutex.hpp>
 
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#include <boost/thread/mutex.hpp>
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#include "drizzled/internal/my_sys.h"
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#include "drizzled/internal/my_bit.h"
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pthread_mutex_t LOCK_thread_count;
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pthread_mutex_t LOCK_status;
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pthread_mutex_t LOCK_global_read_lock;
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pthread_mutex_t LOCK_global_system_variables;
 
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boost::recursive_mutex LOCK_global_system_variables;
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pthread_cond_t COND_refresh, COND_thread_count, COND_global_read_lock;
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pthread_t signal_thread;
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  (void) pthread_mutex_destroy(&LOCK_open);
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  (void) pthread_mutex_destroy(&LOCK_thread_count);
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  (void) pthread_mutex_destroy(&LOCK_status);
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  (void) pthread_mutex_destroy(&LOCK_global_system_variables);
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  (void) pthread_mutex_destroy(&LOCK_global_read_lock);
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  (void) pthread_cond_destroy(&COND_thread_count);
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  (void) pthread_cond_destroy(&COND_server_end);
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  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); 
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  (void) pthread_mutex_init(&LOCK_thread_count, &attr);
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  (void) pthread_mutex_init(&LOCK_global_system_variables, &attr);
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  (void) pthread_mutex_init(&LOCK_status, MY_MUTEX_INIT_FAST);
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  (void) pthread_mutex_init(&LOCK_global_read_lock, MY_MUTEX_INIT_FAST);