1 files changed, 153 insertions, 104 deletions

diff --git a/src/thrd/pool.cpp b/src/thrd/pool.cpp
index dd29d6a..1db639d 100755
--- a/src/thrd/pool.cpp
+++ b/src/thrd/pool.cpp
@@ -2,156 +2,205 @@
 #define POOL_CPP
 
 #include "pool.h"
+#include "thrd.h"
 
 using namespace std;
 
 pool::pool()
 {
-  pthread_mutex_init(&mut_threads, 0);
-  pthread_mutex_init(&mut_queue_tasks, 0);
-  pthread_mutex_init(&mut_num_avail_threads, 0);
-  pthread_cond_init(&cond_new_task, 0);
-
-  i_num_total_threads = 0;
-  i_num_avail_threads = tool::string2int( wrap::CONF->get_elem( "httpd.thread.initpoolsize" ) );
-  increase_pool(i_num_avail_threads);
+    i_thrd_pool_size  = tool::string2int( wrap::CONF->get_elem( "httpd.thread.poolsize" ) );
+    i_thrd_pool_queue = tool::string2int( wrap::CONF->get_elem( "httpd.thread.queuesize" ) );
+    tpool_init( &thread_pool, i_thrd_pool_size, i_thrd_pool_queue, 0 );
 }
 
-pool::~pool()
+void
+pool::tpool_init( tpool_t *tpoolp, int num_worker_threads, int max_queue_size, int do_not_block_when_full )
 {
-  pthread_mutex_lock(&mut_queue_tasks);
-  while (!queue_tasks.empty())
-  {
-    delete queue_tasks.front();
-    queue_tasks.pop();
-  }
-  pthread_mutex_unlock(&mut_queue_tasks);
-
-  pthread_mutex_destroy(&mut_threads);
-  pthread_mutex_destroy(&mut_queue_tasks);
-  pthread_mutex_destroy(&mut_num_avail_threads);
-  pthread_cond_destroy(&cond_new_task);
-}
+    int i, rtn;
+    tpool_t tpool;
 
-int
-pool::increase_pool(int i_num)
-{
-  wrap::system_message(POOLFLL + tool::int2string(i_num) +","+tool::int2string(i_num_total_threads)+")");
-  int i_max_pool_size = tool::string2int( wrap::CONF->get_elem( "httpd.thread.maxpoolsize" ) );
+    // allocate a pool data structure
+    if (( tpool = (tpool_t) malloc( sizeof( struct tpool ) ) ) == NULL )
+    {
+     wrap::system_message( POOLERR );
+     exit(-1);
+    }
+
+    // initialize th fields
+    tpool->num_threads    = num_worker_threads;
+    tpool->max_queue_size = max_queue_size;
+    tpool->do_not_block_when_full = do_not_block_when_full;
 
-  for ( int i = 0; i < i_num; ++i )
-  {
-    if ( i_max_pool_size != 0 && i_num_total_threads >= i_max_pool_size )
+    if ( ( tpool->threads = (pthread_t*) malloc( sizeof( pthread_t ) *num_worker_threads ) ) == NULL )
     {
-      wrap::system_message(POOLER2+tool::int2string(i_max_pool_size)+")");
-      wrap::system_message(POOLER1+tool::int2string(i)+")");
-      return i;
+        wrap::system_message( POOLERR );
+        exit(-1);
     }
 
-    ++i_num_total_threads;
-    pthread_t p_pthread;
-    pthread_create(&p_pthread, 0, wait_for_task, (void*) this );
-  }
+    tpool->cur_queue_size = 0;
+    tpool->queue_head     = NULL;
+    tpool->queue_tail     = NULL;
+    tpool->queue_closed   = 0;
+    tpool->shutdown       = 0;
 
-  return i_num;
-}
+    if ( ( rtn = pthread_mutex_init( &(tpool->queue_lock), NULL ) ) != 0 )
+    {
+        string s_err( "pthread_mutex_init " );
+        s_err.append( strerror( rtn ) );
 
-void
-pool::add_task( void(*p_func)(void*), void* p_void )
-{
-  pthread_mutex_lock(&mut_queue_tasks);
-  queue_tasks.push(new task(p_func, p_void));
-  pthread_mutex_unlock(&mut_queue_tasks);
+        wrap::system_message( s_err );
+
+        exit(-1);
+    }
+    else if ( ( rtn = pthread_cond_init( &(tpool->queue_not_empty), NULL ) ) != 0 )
+    {
+        string s_err( "pthread_mutex_init " );
+        s_err.append( strerror( rtn ) );
 
-  pthread_cond_signal(&cond_new_task);
+        wrap::system_message( s_err );
 
+        exit(-1);
+    }
+    else if ( ( rtn = pthread_cond_init( &(tpool->queue_not_full), NULL ) ) != 0 )
+    {
+        string s_err( "pthread_mutex_init " );
+        s_err.append( strerror( rtn ) );
+
+        wrap::system_message( s_err );
+
+        exit(-1);
+    }
+    else if ( ( rtn = pthread_cond_init( &(tpool->queue_empty), NULL ) ) != 0 )
+    {
+        string s_err( "pthread_mutex_init " );
+        s_err.append( strerror( rtn ) );
+
+        wrap::system_message( s_err );
+
+        exit(-1);
+    }
+    // create threads
+    for ( i = 0; i < num_worker_threads; i++ )
+        pthread_create( &(tpool->threads[i]) , NULL, tpool_thread, (void*)tpool );
+
+    *tpoolp = tpool;
 }
 
 void*
-pool::wait_for_task( void* p_void )
+pool::tpool_thread( void* arg )
 {
-  pool* p_pool = static_cast<pool*>(p_void);
+    tpool_t tpool = (tpool_t) arg;
+    tpool_work_t *my_workp;
 
-  for (;;)
-  {
+    while( true )
+    {
+        pthread_mutex_lock( &(tpool->queue_lock) );
 
-#ifdef NCURSES
-    p_pool->print_pool_size();
-#endif
+        while ( (tpool->cur_queue_size == 0) && (!tpool->shutdown) )
+            pthread_cond_wait( &(tpool->queue_not_empty), &(tpool->queue_lock) );
 
-    pthread_mutex_lock(&p_pool->mut_threads);
-    pthread_cond_wait(&p_pool->cond_new_task, &p_pool->mut_threads);
+        if (tpool->shutdown)
+        {
+            pthread_mutex_unlock( &(tpool->queue_lock) );
+            pthread_exit( NULL );
+        }
 
-    pthread_mutex_lock(&p_pool->mut_num_avail_threads);
-    if ( --p_pool->i_num_avail_threads < 5 )
-    {
-      int i_size = 9 - p_pool->i_num_avail_threads;
-      i_size = p_pool->increase_pool(i_size);
-      p_pool->i_num_avail_threads += i_size;
-    }
-    pthread_mutex_unlock(&p_pool->mut_num_avail_threads);
+        my_workp = tpool->queue_head;
+        tpool->cur_queue_size--;
 
-    pthread_mutex_lock(&p_pool->mut_queue_tasks);
-    task* p_task = p_pool->queue_tasks.front();
-    p_pool->queue_tasks.pop();
-    pthread_mutex_unlock(&p_pool->mut_queue_tasks);
+        if ( tpool->cur_queue_size == 0)
+            tpool->queue_head = tpool->queue_tail = NULL;
 
-    pthread_mutex_unlock(&p_pool->mut_threads);
+        else
+            tpool->queue_head = my_workp->next;
 
-    (*(p_task->p_func))(p_task->p_void);
-    delete p_task;
+        if ( ( ! tpool->do_not_block_when_full ) &&
+                (   tpool->cur_queue_size == ( tpool->max_queue_size - 1 ) ) )
+            pthread_cond_signal( &(tpool->queue_not_full) );
 
-    pthread_mutex_lock(&p_pool->mut_num_avail_threads);
-    p_pool->i_num_avail_threads++;
-    pthread_mutex_unlock(&p_pool->mut_num_avail_threads);
-  }
+        if ( tpool->cur_queue_size == 0 )
+            pthread_cond_signal( &(tpool->queue_empty) );
 
-  return 0;
+        pthread_mutex_unlock( &(tpool->queue_lock) );
+        (*(my_workp->routine))(my_workp->arg);
+        free((void*)my_workp);
+    }
 }
 
-void
-pool::run(void* p_void)
+void pool::run_func( void *v_pointer )
 {
-  add_task(run_func, p_void);
-}
+    wrap::SOCK->increase_num_threads();
 
-void
-pool::run_func(void *p_void)
-{
-  socketcontainer* p_sock = static_cast<socketcontainer*>(p_void);
-  wrap::SOCK->read_write(p_sock);
+    // recasting the client thread object.
+    thrd *t = (thrd*) v_pointer;
+
+    // start parsing the client request and sending response's back.
+    t-> run ();
+
+    // close the client socket.
+    t->~thrd();
+
+    wrap::SOCK->decrease_num_threads();
+
+    free(v_pointer);
 }
 
-bool
-pool::allow_user_login()
+int
+pool::tpool_add_work( tpool_t tpool, void(*routine)(void*), void* arg ) ///
 {
-  pthread_mutex_lock(&mut_num_avail_threads);
-  if ( i_num_avail_threads < 2 )
-  {
-    int i_max_pool_size = tool::string2int( wrap::CONF->get_elem( "httpd.thread.maxpoolsize" ) );
-    if ( i_max_pool_size != 0 && i_max_pool_size == i_num_total_threads )
+    tpool_work_t *workp;
+    pthread_mutex_lock( &(tpool->queue_lock) );
+
+    if( ( tpool->cur_queue_size == tpool->max_queue_size ) &&
+            tpool->do_not_block_when_full )
     {
-      pthread_mutex_unlock(&mut_num_avail_threads);
-      return false;
+        pthread_mutex_unlock( &(tpool->queue_lock) );
+        return -1;
     }
-  }
-  pthread_mutex_unlock(&mut_num_avail_threads);
 
-  return true;
+    while( (     tpool->cur_queue_size == tpool->max_queue_size ) &&
+            ( ! ( tpool->shutdown       || tpool->queue_closed   ) ) )
+        pthread_cond_wait( &(tpool->queue_not_full), &(tpool->queue_lock) );
+
+    if( tpool->shutdown || tpool->queue_closed )
+    {
+        pthread_mutex_unlock( &tpool->queue_lock );
+        return -1;
+    }
+
+    // allocate work structure:
+    workp = (tpool_work_t*) malloc( sizeof( tpool_work_t ) );
+
+    workp->routine = routine;
+    workp->arg     = arg;
+    workp->next    = NULL;
+
+    if( tpool->cur_queue_size == 0 )
+    {
+        tpool->queue_tail = tpool->queue_head = workp;
+    }
+    else
+    {
+        (tpool->queue_tail)->next = workp;
+        tpool->queue_tail         = workp;
+    }
+
+    pthread_cond_signal( &tpool->queue_not_empty );
+    tpool->cur_queue_size++;
+    pthread_mutex_unlock( &(tpool->queue_lock) );
+    return 1;
 }
 
 #ifdef NCURSES
 void
 pool::print_pool_size()
 {
-  if ( wrap::NCUR->is_ready() )
-  {
-    pthread_mutex_lock(&mut_num_avail_threads);
-    mvprintw( NCUR_POOL_WAIT_X,NCUR_POOL_WAIT_Y, "Wait/Tot: %d/%d  ", i_num_avail_threads, i_num_total_threads);
-    mvprintw( NCUR_POOL_RUNNING_X,NCUR_POOL_RUNNING_Y, "Running: %d  ", i_num_total_threads-i_num_avail_threads);
-    pthread_mutex_unlock(&mut_num_avail_threads);
-    refresh();
-  }
+    if ( wrap::NCUR->is_ready() )
+    {
+     mvprintw( NCUR_POOL_SIZE_X,NCUR_POOL_SIZE_Y, "Size: %d %d", i_thrd_pool_size, i_thrd_pool_queue );
+     refresh();
+   }
 }
 #endif
+
 #endif