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tpool.c File Reference
#include "portable.h"
#include <stdio.h>
#include <ac/signal.h>
#include <ac/stdarg.h>
#include <ac/stdlib.h>
#include <ac/string.h>
#include <ac/time.h>
#include <ac/errno.h>
#include "ldap-int.h"
#include "ldap_pvt_thread.h"
#include "ldap_queue.h"
#include "ldap_thr_debug.h"

Go to the source code of this file.

Classes

struct  ldap_int_tpool_key_s
struct  ldap_int_thread_userctx_s
struct  ldap_int_thread_task_s
union  ldap_int_thread_task_s.ltt_next

Defines

#define LDAP_THREAD_POOL_IMPLEMENTATION
#define MAXKEYS   32
#define LDAP_MAXTHR   1024 /* must be a power of 2 */
#define MAX_PENDING   (INT_MAX/2) /* INT_MAX - (room to avoid overflow) */
#define DELETED_THREAD_CTX   (&ldap_int_main_thrctx + 1) /* dummy addr */
#define TID_HASH(tid, hash)
#define SET_VARY_OPEN_COUNT(pool)
#define GO_IDLE   8
#define GO_UNIDLE   16
#define CHECK_PAUSE   32 /* if ltp_pause: GO_IDLE; wait; GO_UNIDLE */
#define DO_PAUSE   64 /* CHECK_PAUSE; pause the pool */
#define PAUSE_ARG(a)   ((a) | ((a) & (GO_IDLE|GO_UNIDLE) ? GO_IDLE-1 : CHECK_PAUSE))

Typedefs

typedef struct ldap_int_tpool_key_s ldap_int_tpool_key_t
typedef struct
ldap_int_thread_userctx_s 
ldap_int_thread_userctx_t
typedef struct
ldap_int_thread_task_s 
ldap_int_thread_task_t

Enumerations

enum  { NOT_PAUSED = 0, WANT_PAUSE = 1, PAUSED = 2 }

Functions

typedef LDAP_STAILQ_HEAD (tcq, ldap_int_thread_task_s)
static LDAP_STAILQ_HEAD (tpq, ldap_int_thread_pool_s)
int ldap_int_thread_pool_shutdown (void)
int ldap_pvt_thread_pool_init (ldap_pvt_thread_pool_t *tpool, int max_threads, int max_pending)
int ldap_pvt_thread_pool_submit (ldap_pvt_thread_pool_t *tpool, ldap_pvt_thread_start_t *start_routine, void *arg)
static voidno_task (void *ctx, void *arg)
int ldap_pvt_thread_pool_retract (ldap_pvt_thread_pool_t *tpool, ldap_pvt_thread_start_t *start_routine, void *arg)
int ldap_pvt_thread_pool_maxthreads (ldap_pvt_thread_pool_t *tpool, int max_threads)
int ldap_pvt_thread_pool_query (ldap_pvt_thread_pool_t *tpool, ldap_pvt_thread_pool_param_t param, void *value)
int ldap_pvt_thread_pool_pausing (ldap_pvt_thread_pool_t *tpool)
int ldap_pvt_thread_pool_backload (ldap_pvt_thread_pool_t *tpool)
int ldap_pvt_thread_pool_destroy (ldap_pvt_thread_pool_t *tpool, int run_pending)
static voidldap_int_thread_pool_wrapper (void *xpool)
static int handle_pause (ldap_pvt_thread_pool_t *tpool, int pause_type)
void ldap_pvt_thread_pool_idle (ldap_pvt_thread_pool_t *tpool)
void ldap_pvt_thread_pool_unidle (ldap_pvt_thread_pool_t *tpool)
int ldap_pvt_thread_pool_pausecheck (ldap_pvt_thread_pool_t *tpool)
int ldap_pvt_thread_pool_pause (ldap_pvt_thread_pool_t *tpool)
int ldap_pvt_thread_pool_resume (ldap_pvt_thread_pool_t *tpool)
int ldap_pvt_thread_pool_getkey (void *xctx, void *key, void **data, ldap_pvt_thread_pool_keyfree_t **kfree)
static void clear_key_idx (ldap_int_thread_userctx_t *ctx, int i)
int ldap_pvt_thread_pool_setkey (void *xctx, void *key, void *data, ldap_pvt_thread_pool_keyfree_t *kfree, void **olddatap, ldap_pvt_thread_pool_keyfree_t **oldkfreep)
void ldap_pvt_thread_pool_purgekey (void *key)
voidldap_pvt_thread_pool_context ()
void ldap_pvt_thread_pool_context_reset (void *vctx)
ldap_pvt_thread_t ldap_pvt_thread_pool_tid (void *vctx)

Variables

struct {
ldap_int_thread_userctx_tctx
thread_keys [LDAP_MAXTHR]
static ldap_int_tpool_plist_t empty_pending_list
static int ldap_int_has_thread_pool = 0

Class Documentation

struct ldap_int_tpool_key_s

Definition at line 36 of file tpool.c.

Class Members
void * ltk_data
ldap_pvt_thread_pool_keyfree_t * ltk_free
void * ltk_key
struct ldap_int_thread_userctx_s

Definition at line 57 of file tpool.c.

Collaboration diagram for ldap_int_thread_userctx_s:
Class Members
ldap_pvt_thread_t ltu_id
ldap_int_tpool_key_t ltu_key
struct ldap_int_thread_task_s

Definition at line 83 of file tpool.c.

Class Members
void * ltt_arg
union ldap_int_thread_task_s ltt_next
ldap_pvt_thread_start_t * ltt_start_routine
union ldap_int_thread_task_s.ltt_next

Definition at line 84 of file tpool.c.


Define Documentation

#define CHECK_PAUSE   32 /* if ltp_pause: GO_IDLE; wait; GO_UNIDLE */

Definition at line 722 of file tpool.c.

#define DELETED_THREAD_CTX   (&ldap_int_main_thrctx + 1) /* dummy addr */

Definition at line 71 of file tpool.c.

#define DO_PAUSE   64 /* CHECK_PAUSE; pause the pool */

Definition at line 723 of file tpool.c.

#define GO_IDLE   8

Definition at line 720 of file tpool.c.

#define GO_UNIDLE   16

Definition at line 721 of file tpool.c.

#define LDAP_MAXTHR   1024 /* must be a power of 2 */

Definition at line 48 of file tpool.c.

Definition at line 30 of file tpool.c.

#define MAX_PENDING   (INT_MAX/2) /* INT_MAX - (room to avoid overflow) */

Definition at line 51 of file tpool.c.

#define MAXKEYS   32

Definition at line 45 of file tpool.c.

#define PAUSE_ARG (   a)    ((a) | ((a) & (GO_IDLE|GO_UNIDLE) ? GO_IDLE-1 : CHECK_PAUSE))

Definition at line 724 of file tpool.c.

#define SET_VARY_OPEN_COUNT (   pool)
Value:
((pool)->ltp_vary_open_count =     \
               (pool)->ltp_pause      ?  1 :     \
               (pool)->ltp_finishing  ? -1 :     \
               ((pool)->ltp_max_count ? (pool)->ltp_max_count : LDAP_MAXTHR) \
               - (pool)->ltp_open_count)
#define TID_HASH (   tid,
  hash 
)
Value:
do { \
       unsigned const char *ptr_ = (unsigned const char *)&(tid); \
       unsigned i_; \
       for (i_ = 0, (hash) = ptr_[0]; ++i_ < sizeof(tid);) \
              (hash) += ((hash) << 5) ^ ptr_[i_]; \
} while(0)

Definition at line 74 of file tpool.c.


Typedef Documentation


Enumeration Type Documentation

anonymous enum
Enumerator:
NOT_PAUSED 
WANT_PAUSE 
PAUSED 

Definition at line 54 of file tpool.c.

{ NOT_PAUSED = 0, WANT_PAUSE = 1, PAUSED = 2 };

Function Documentation

static void clear_key_idx ( ldap_int_thread_userctx_t ctx,
int  i 
) [static]

Definition at line 889 of file tpool.c.

{
       for ( ; i < MAXKEYS-1 && ctx->ltu_key[i+1].ltk_key; i++ )
              ctx->ltu_key[i] = ctx->ltu_key[i+1];
       ctx->ltu_key[i].ltk_key = NULL;
}

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static int handle_pause ( ldap_pvt_thread_pool_t tpool,
int  pause_type 
) [static]

Definition at line 728 of file tpool.c.

{
       struct ldap_int_thread_pool_s *pool;
       int ret = 0, pause, max_ltp_pause;

       if (tpool == NULL)
              return(-1);

       pool = *tpool;

       if (pool == NULL)
              return(0);

       if (pause_type == CHECK_PAUSE && !pool->ltp_pause)
              return(0);

       /* Let pool_unidle() ignore requests for new pauses */
       max_ltp_pause = pause_type==PAUSE_ARG(GO_UNIDLE) ? WANT_PAUSE : NOT_PAUSED;

       ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);

       pause = pool->ltp_pause;    /* NOT_PAUSED, WANT_PAUSE or PAUSED */

       /* If ltp_pause and not GO_IDLE|GO_UNIDLE: Set GO_IDLE,GO_UNIDLE */
       pause_type -= pause;

       if (pause_type & GO_IDLE) {
              pool->ltp_pending_count++;
              pool->ltp_active_count--;
              if (pause && pool->ltp_active_count < 2) {
                     /* Tell the task waiting to DO_PAUSE it can proceed */
                     ldap_pvt_thread_cond_signal(&pool->ltp_pcond);
              }
       }

       if (pause_type & GO_UNIDLE) {
              /* Wait out pause if any, then cancel GO_IDLE */
              if (pause > max_ltp_pause) {
                     ret = 1;
                     do {
                            ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
                     } while (pool->ltp_pause > max_ltp_pause);
              }
              pool->ltp_pending_count--;
              pool->ltp_active_count++;
       }

       if (pause_type & DO_PAUSE) {
              /* Tell everyone else to pause or finish, then await that */
              ret = 0;
              assert(!pool->ltp_pause);
              pool->ltp_pause = WANT_PAUSE;
              /* Let ldap_pvt_thread_pool_submit() through to its ltp_pause test,
               * and do not finish threads in ldap_pvt_thread_pool_wrapper() */
              pool->ltp_open_count = -pool->ltp_open_count;
              SET_VARY_OPEN_COUNT(pool);
              /* Hide pending tasks from ldap_pvt_thread_pool_wrapper() */
              pool->ltp_work_list = &empty_pending_list;
              /* Wait for this task to become the sole active task */
              while (pool->ltp_active_count > 1) {
                     ldap_pvt_thread_cond_wait(&pool->ltp_pcond, &pool->ltp_mutex);
              }
              assert(pool->ltp_pause == WANT_PAUSE);
              pool->ltp_pause = PAUSED;
       }

       ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
       return(ret);
}

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Definition at line 179 of file tpool.c.

{
       struct ldap_int_thread_pool_s *pool;

       while ((pool = LDAP_STAILQ_FIRST(&ldap_int_thread_pool_list)) != NULL) {
              (ldap_pvt_thread_pool_destroy)(&pool, 0); /* ignore thr_debug macro */
       }
       ldap_pvt_thread_mutex_destroy(&ldap_pvt_thread_pool_mutex);
       ldap_pvt_thread_key_destroy( ldap_tpool_key );
       return(0);
}

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static void* ldap_int_thread_pool_wrapper ( void xpool) [static]

Definition at line 606 of file tpool.c.

{
       struct ldap_int_thread_pool_s *pool = xpool;
       ldap_int_thread_task_t *task;
       ldap_int_tpool_plist_t *work_list;
       ldap_int_thread_userctx_t ctx, *kctx;
       unsigned i, keyslot, hash;

       assert(pool != NULL);

       for ( i=0; i<MAXKEYS; i++ ) {
              ctx.ltu_key[i].ltk_key = NULL;
       }

       ctx.ltu_id = ldap_pvt_thread_self();
       TID_HASH(ctx.ltu_id, hash);

       ldap_pvt_thread_key_setdata( ldap_tpool_key, &ctx );

       ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);

       /* thread_keys[] is read-only when paused */
       while (pool->ltp_pause)
              ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);

       /* find a key slot to give this thread ID and store a
        * pointer to our keys there; start at the thread ID
        * itself (mod LDAP_MAXTHR) and look for an empty slot.
        */
       ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
       for (keyslot = hash & (LDAP_MAXTHR-1);
              (kctx = thread_keys[keyslot].ctx) && kctx != DELETED_THREAD_CTX;
              keyslot = (keyslot+1) & (LDAP_MAXTHR-1));
       thread_keys[keyslot].ctx = &ctx;
       ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);

       pool->ltp_starting--;
       pool->ltp_active_count++;

       for (;;) {
              work_list = pool->ltp_work_list; /* help the compiler a bit */
              task = LDAP_STAILQ_FIRST(work_list);
              if (task == NULL) {  /* paused or no pending tasks */
                     if (--(pool->ltp_active_count) < 2) {
                            /* Notify pool_pause it is the sole active thread. */
                            ldap_pvt_thread_cond_signal(&pool->ltp_pcond);
                     }

                     do {
                            if (pool->ltp_vary_open_count < 0) {
                                   /* Not paused, and either finishing or too many
                                    * threads running (can happen if ltp_max_count
                                    * was reduced).  Let this thread die.
                                    */
                                   goto done;
                            }

                            /* We could check an idle timer here, and let the
                             * thread die if it has been inactive for a while.
                             * Only die if there are other open threads (i.e.,
                             * always have at least one thread open).
                             * The check should be like this:
                             *   if (pool->ltp_open_count>1 && pool->ltp_starting==0)
                             *       check timer, wait if ltp_pause, leave thread;
                             *
                             * Just use pthread_cond_timedwait() if we want to
                             * check idle time.
                             */
                            ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);

                            work_list = pool->ltp_work_list;
                            task = LDAP_STAILQ_FIRST(work_list);
                     } while (task == NULL);

                     pool->ltp_active_count++;
              }

              LDAP_STAILQ_REMOVE_HEAD(work_list, ltt_next.q);
              pool->ltp_pending_count--;
              ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);

              task->ltt_start_routine(&ctx, task->ltt_arg);

              ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
              LDAP_SLIST_INSERT_HEAD(&pool->ltp_free_list, task, ltt_next.l);
       }
 done:

       assert(!pool->ltp_pause); /* thread_keys writable, ltp_open_count >= 0 */

       /* The ltp_mutex lock protects ctx->ltu_key from pool_purgekey()
        * during this call, since it prevents new pauses. */
       ldap_pvt_thread_pool_context_reset(&ctx);

       ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
       thread_keys[keyslot].ctx = DELETED_THREAD_CTX;
       ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);

       pool->ltp_open_count--;
       SET_VARY_OPEN_COUNT(pool);
       /* let pool_destroy know we're all done */
       if (pool->ltp_open_count == 0)
              ldap_pvt_thread_cond_signal(&pool->ltp_cond);

       ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);

       ldap_pvt_thread_exit(NULL);
       return(NULL);
}

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Definition at line 529 of file tpool.c.

{
       int    rc, count;

       rc = ldap_pvt_thread_pool_query( tpool,
              LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD, (void *)&count );

       if ( rc == 0 ) {
              return count;
       }

       return rc;
}

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Definition at line 990 of file tpool.c.

{
       void *ctx = NULL;

       ldap_pvt_thread_key_getdata( ldap_tpool_key, &ctx );
       return ctx ? ctx : (void *) &ldap_int_main_thrctx;
}

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Definition at line 1003 of file tpool.c.

{
       ldap_int_thread_userctx_t *ctx = vctx;
       int i;

       for ( i=MAXKEYS-1; i>=0; i--) {
              if ( !ctx->ltu_key[i].ltk_key )
                     continue;
              if ( ctx->ltu_key[i].ltk_free )
                     ctx->ltu_key[i].ltk_free( ctx->ltu_key[i].ltk_key,
                     ctx->ltu_key[i].ltk_data );
              ctx->ltu_key[i].ltk_key = NULL;
       }
}

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Definition at line 545 of file tpool.c.

{
       struct ldap_int_thread_pool_s *pool, *pptr;
       ldap_int_thread_task_t *task;

       if (tpool == NULL)
              return(-1);

       pool = *tpool;

       if (pool == NULL) return(-1);

       ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
       LDAP_STAILQ_FOREACH(pptr, &ldap_int_thread_pool_list, ltp_next)
              if (pptr == pool) break;
       if (pptr == pool)
              LDAP_STAILQ_REMOVE(&ldap_int_thread_pool_list, pool,
                     ldap_int_thread_pool_s, ltp_next);
       ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);

       if (pool != pptr) return(-1);

       ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);

       pool->ltp_finishing = 1;
       SET_VARY_OPEN_COUNT(pool);
       if (pool->ltp_max_pending > 0)
              pool->ltp_max_pending = -pool->ltp_max_pending;

       if (!run_pending) {
              while ((task = LDAP_STAILQ_FIRST(&pool->ltp_pending_list)) != NULL) {
                     LDAP_STAILQ_REMOVE_HEAD(&pool->ltp_pending_list, ltt_next.q);
                     LDAP_FREE(task);
              }
              pool->ltp_pending_count = 0;
       }

       while (pool->ltp_open_count) {
              if (!pool->ltp_pause)
                     ldap_pvt_thread_cond_broadcast(&pool->ltp_cond);
              ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
       }

       while ((task = LDAP_SLIST_FIRST(&pool->ltp_free_list)) != NULL)
       {
              LDAP_SLIST_REMOVE_HEAD(&pool->ltp_free_list, ltt_next.l);
              LDAP_FREE(task);
       }

       ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
       ldap_pvt_thread_cond_destroy(&pool->ltp_pcond);
       ldap_pvt_thread_cond_destroy(&pool->ltp_cond);
       ldap_pvt_thread_mutex_destroy(&pool->ltp_mutex);
       LDAP_FREE(pool);
       *tpool = NULL;
       ldap_int_has_thread_pool = 0;
       return(0);
}

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int ldap_pvt_thread_pool_getkey ( void xctx,
void key,
void **  data,
ldap_pvt_thread_pool_keyfree_t **  kfree 
)

Definition at line 867 of file tpool.c.

{
       ldap_int_thread_userctx_t *ctx = xctx;
       int i;

       if ( !ctx || !key || !data ) return EINVAL;

       for ( i=0; i<MAXKEYS && ctx->ltu_key[i].ltk_key; i++ ) {
              if ( ctx->ltu_key[i].ltk_key == key ) {
                     *data = ctx->ltu_key[i].ltk_data;
                     if ( kfree ) *kfree = ctx->ltu_key[i].ltk_free;
                     return 0;
              }
       }
       return ENOENT;
}

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Definition at line 800 of file tpool.c.

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int ldap_pvt_thread_pool_init ( ldap_pvt_thread_pool_t tpool,
int  max_threads,
int  max_pending 
)

Definition at line 194 of file tpool.c.

{
       ldap_pvt_thread_pool_t pool;
       int rc;

       /* multiple pools are currently not supported (ITS#4943) */
       assert(!ldap_int_has_thread_pool);

       if (! (0 <= max_threads && max_threads <= LDAP_MAXTHR))
              max_threads = 0;
       if (! (1 <= max_pending && max_pending <= MAX_PENDING))
              max_pending = MAX_PENDING;

       *tpool = NULL;
       pool = (ldap_pvt_thread_pool_t) LDAP_CALLOC(1,
              sizeof(struct ldap_int_thread_pool_s));

       if (pool == NULL) return(-1);

       rc = ldap_pvt_thread_mutex_init(&pool->ltp_mutex);
       if (rc != 0)
              return(rc);
       rc = ldap_pvt_thread_cond_init(&pool->ltp_cond);
       if (rc != 0)
              return(rc);
       rc = ldap_pvt_thread_cond_init(&pool->ltp_pcond);
       if (rc != 0)
              return(rc);

       ldap_int_has_thread_pool = 1;

       pool->ltp_max_count = max_threads;
       SET_VARY_OPEN_COUNT(pool);
       pool->ltp_max_pending = max_pending;

       LDAP_STAILQ_INIT(&pool->ltp_pending_list);
       pool->ltp_work_list = &pool->ltp_pending_list;
       LDAP_SLIST_INIT(&pool->ltp_free_list);

       ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
       LDAP_STAILQ_INSERT_TAIL(&ldap_int_thread_pool_list, pool, ltp_next);
       ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);

       /* Start no threads just yet.  That can break if the process forks
        * later, as slapd does in order to daemonize.  On at least POSIX,
        * only the forking thread would survive in the child.  Yet fork()
        * can't unlock/clean up other threads' locks and data structures,
        * unless pthread_atfork() handlers have been set up to do so.
        */

       *tpool = pool;
       return(0);
}

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Definition at line 393 of file tpool.c.

{
       struct ldap_int_thread_pool_s *pool;

       if (! (0 <= max_threads && max_threads <= LDAP_MAXTHR))
              max_threads = 0;

       if (tpool == NULL)
              return(-1);

       pool = *tpool;

       if (pool == NULL)
              return(-1);

       ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);

       pool->ltp_max_count = max_threads;
       SET_VARY_OPEN_COUNT(pool);

       ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
       return(0);
}

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Definition at line 829 of file tpool.c.

{
       return handle_pause(tpool, PAUSE_ARG(DO_PAUSE));
}

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Definition at line 819 of file tpool.c.

{
       return handle_pause(tpool, PAUSE_ARG(CHECK_PAUSE));
}

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Definition at line 512 of file tpool.c.

{
       int rc = -1;
       struct ldap_int_thread_pool_s *pool;

       if ( tpool != NULL && (pool = *tpool) != NULL ) {
              rc = (pool->ltp_pause != 0);
       }

       return rc;
}

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Definition at line 959 of file tpool.c.

{
       int i, j;
       ldap_int_thread_userctx_t *ctx;

       assert ( key != NULL );

       for ( i=0; i<LDAP_MAXTHR; i++ ) {
              ctx = thread_keys[i].ctx;
              if ( ctx && ctx != DELETED_THREAD_CTX ) {
                     for ( j=0; j<MAXKEYS && ctx->ltu_key[j].ltk_key; j++ ) {
                            if ( ctx->ltu_key[j].ltk_key == key ) {
                                   if (ctx->ltu_key[j].ltk_free)
                                          ctx->ltu_key[j].ltk_free( ctx->ltu_key[j].ltk_key,
                                          ctx->ltu_key[j].ltk_data );
                                   clear_key_idx( ctx, j );
                                   break;
                            }
                     }
              }
       }
}

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Definition at line 421 of file tpool.c.

{
       struct ldap_int_thread_pool_s      *pool;
       int                         count = -1;

       if ( tpool == NULL || value == NULL ) {
              return -1;
       }

       pool = *tpool;

       if ( pool == NULL ) {
              return 0;
       }

       ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
       switch ( param ) {
       case LDAP_PVT_THREAD_POOL_PARAM_MAX:
              count = pool->ltp_max_count;
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_MAX_PENDING:
              count = pool->ltp_max_pending;
              if (count < 0)
                     count = -count;
              if (count == MAX_PENDING)
                     count = 0;
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_OPEN:
              count = pool->ltp_open_count;
              if (count < 0)
                     count = -count;
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_STARTING:
              count = pool->ltp_starting;
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_ACTIVE:
              count = pool->ltp_active_count;
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_PAUSING:
              count = (pool->ltp_pause != 0);
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_PENDING:
              count = pool->ltp_pending_count;
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD:
              count = pool->ltp_pending_count + pool->ltp_active_count;
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_ACTIVE_MAX:
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_PENDING_MAX:
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD_MAX:
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_STATE:
              *((char **)value) =
                     pool->ltp_pause ? "pausing" :
                     !pool->ltp_finishing ? "running" :
                     pool->ltp_pending_count ? "finishing" : "stopping";
              break;

       case LDAP_PVT_THREAD_POOL_PARAM_UNKNOWN:
              break;
       }
       ldap_pvt_thread_mutex_unlock( &pool->ltp_mutex );

       if ( count > -1 ) {
              *((int *)value) = count;
       }

       return ( count == -1 ? -1 : 0 );
}

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Definition at line 836 of file tpool.c.

{
       struct ldap_int_thread_pool_s *pool;

       if (tpool == NULL)
              return(-1);

       pool = *tpool;

       if (pool == NULL)
              return(0);

       ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);

       assert(pool->ltp_pause == PAUSED);
       pool->ltp_pause = 0;
       if (pool->ltp_open_count <= 0) /* true when paused, but be paranoid */
              pool->ltp_open_count = -pool->ltp_open_count;
       SET_VARY_OPEN_COUNT(pool);
       pool->ltp_work_list = &pool->ltp_pending_list;

       ldap_pvt_thread_cond_broadcast(&pool->ltp_cond);

       ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
       return(0);
}

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int ldap_pvt_thread_pool_retract ( ldap_pvt_thread_pool_t tpool,
ldap_pvt_thread_start_t *  start_routine,
void arg 
)

Definition at line 361 of file tpool.c.

{
       struct ldap_int_thread_pool_s *pool;
       ldap_int_thread_task_t *task;

       if (tpool == NULL)
              return(-1);

       pool = *tpool;

       if (pool == NULL)
              return(-1);

       ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
       LDAP_STAILQ_FOREACH(task, &pool->ltp_pending_list, ltt_next.q)
              if (task->ltt_start_routine == start_routine &&
                     task->ltt_arg == arg) {
                     /* Could LDAP_STAILQ_REMOVE the task, but that
                      * walks ltp_pending_list again to find it.
                      */
                     task->ltt_start_routine = no_task;
                     task->ltt_arg = NULL;
                     break;
              }
       ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
       return task != NULL;
}

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int ldap_pvt_thread_pool_setkey ( void xctx,
void key,
void data,
ldap_pvt_thread_pool_keyfree_t *  kfree,
void **  olddatap,
ldap_pvt_thread_pool_keyfree_t **  oldkfreep 
)

Definition at line 905 of file tpool.c.

{
       ldap_int_thread_userctx_t *ctx = xctx;
       int i, found;

       if ( !ctx || !key ) return EINVAL;

       for ( i=found=0; i<MAXKEYS; i++ ) {
              if ( ctx->ltu_key[i].ltk_key == key ) {
                     found = 1;
                     break;
              } else if ( !ctx->ltu_key[i].ltk_key ) {
                     break;
              }
       }

       if ( olddatap ) {
              if ( found ) {
                     *olddatap = ctx->ltu_key[i].ltk_data;
              } else {
                     *olddatap = NULL;
              }
       }

       if ( oldkfreep ) {
              if ( found ) {
                     *oldkfreep = ctx->ltu_key[i].ltk_free;
              } else {
                     *oldkfreep = 0;
              }
       }

       if ( data || kfree ) {
              if ( i>=MAXKEYS )
                     return ENOMEM;
              ctx->ltu_key[i].ltk_key = key;
              ctx->ltu_key[i].ltk_data = data;
              ctx->ltu_key[i].ltk_free = kfree;
       } else if ( found ) {
              clear_key_idx( ctx, i );
       }

       return 0;
}

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int ldap_pvt_thread_pool_submit ( ldap_pvt_thread_pool_t tpool,
ldap_pvt_thread_start_t *  start_routine,
void arg 
)

Definition at line 254 of file tpool.c.

{
       struct ldap_int_thread_pool_s *pool;
       ldap_int_thread_task_t *task;
       ldap_pvt_thread_t thr;

       if (tpool == NULL)
              return(-1);

       pool = *tpool;

       if (pool == NULL)
              return(-1);

       ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);

       if (pool->ltp_pending_count >= pool->ltp_max_pending)
              goto failed;

       task = LDAP_SLIST_FIRST(&pool->ltp_free_list);
       if (task) {
              LDAP_SLIST_REMOVE_HEAD(&pool->ltp_free_list, ltt_next.l);
       } else {
              task = (ldap_int_thread_task_t *) LDAP_MALLOC(sizeof(*task));
              if (task == NULL)
                     goto failed;
       }

       task->ltt_start_routine = start_routine;
       task->ltt_arg = arg;

       pool->ltp_pending_count++;
       LDAP_STAILQ_INSERT_TAIL(&pool->ltp_pending_list, task, ltt_next.q);

       /* true if ltp_pause != 0 or we should open (create) a thread */
       if (pool->ltp_vary_open_count > 0 &&
              pool->ltp_open_count < pool->ltp_active_count+pool->ltp_pending_count)
       {
              if (pool->ltp_pause)
                     goto done;

              pool->ltp_starting++;
              pool->ltp_open_count++;
              SET_VARY_OPEN_COUNT(pool);

              if (0 != ldap_pvt_thread_create(
                     &thr, 1, ldap_int_thread_pool_wrapper, pool))
              {
                     /* couldn't create thread.  back out of
                      * ltp_open_count and check for even worse things.
                      */
                     pool->ltp_starting--;
                     pool->ltp_open_count--;
                     SET_VARY_OPEN_COUNT(pool);

                     if (pool->ltp_open_count == 0) {
                            /* no open threads at all?!?
                             */
                            ldap_int_thread_task_t *ptr;

                            /* let pool_destroy know there are no more threads */
                            ldap_pvt_thread_cond_signal(&pool->ltp_cond);

                            LDAP_STAILQ_FOREACH(ptr, &pool->ltp_pending_list, ltt_next.q)
                                   if (ptr == task) break;
                            if (ptr == task) {
                                   /* no open threads, task not handled, so
                                    * back out of ltp_pending_count, free the task,
                                    * report the error.
                                    */
                                   pool->ltp_pending_count--;
                                   LDAP_STAILQ_REMOVE(&pool->ltp_pending_list, task,
                                          ldap_int_thread_task_s, ltt_next.q);
                                   LDAP_SLIST_INSERT_HEAD(&pool->ltp_free_list, task,
                                          ltt_next.l);
                                   goto failed;
                            }
                     }
                     /* there is another open thread, so this
                      * task will be handled eventually.
                      */
              }
       }
       ldap_pvt_thread_cond_signal(&pool->ltp_cond);

 done:
       ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
       return(0);

 failed:
       ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
       return(-1);
}

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Definition at line 1018 of file tpool.c.

{
       ldap_int_thread_userctx_t *ctx = vctx;

       return ctx->ltu_id;
}

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Definition at line 807 of file tpool.c.

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typedef LDAP_STAILQ_HEAD ( tcq  ,
ldap_int_thread_task_s   
)

Definition at line 92 of file tpool.c.

                              {
       LDAP_STAILQ_ENTRY(ldap_int_thread_pool_s) ltp_next;

       /* protect members below, and protect thread_keys[] during pauses */
       ldap_pvt_thread_mutex_t ltp_mutex;

       /* not paused and something to do for pool_<wrapper/pause/destroy>() */
       ldap_pvt_thread_cond_t ltp_cond;

       /* ltp_active_count <= 1 && ltp_pause */
       ldap_pvt_thread_cond_t ltp_pcond;

       /* ltp_pause == 0 ? &ltp_pending_list : &empty_pending_list,
        * maintaned to reduce work for pool_wrapper()
        */
       ldap_int_tpool_plist_t *ltp_work_list;

       /* pending tasks, and unused task objects */
       ldap_int_tpool_plist_t ltp_pending_list;
       LDAP_SLIST_HEAD(tcl, ldap_int_thread_task_s) ltp_free_list;

       /* The pool is finishing, waiting for its threads to close.
        * They close when ltp_pending_list is done.  pool_submit()
        * rejects new tasks.  ltp_max_pending = -(its old value).
        */
       int ltp_finishing;

       /* Some active task needs to be the sole active task.
        * Atomic variable so ldap_pvt_thread_pool_pausing() can read it.
        * Note: Pauses adjust ltp_<open_count/vary_open_count/work_list>,
        * so pool_<submit/wrapper>() mostly can avoid testing ltp_pause.
        */
       volatile sig_atomic_t ltp_pause;

       /* Max number of threads in pool, or 0 for default (LDAP_MAXTHR) */
       int ltp_max_count;

       /* Max pending + paused + idle tasks, negated when ltp_finishing */
       int ltp_max_pending;

       int ltp_pending_count;             /* Pending + paused + idle tasks */
       int ltp_active_count;              /* Active, not paused/idle tasks */
       int ltp_open_count;                /* Number of threads, negated when ltp_pause */
       int ltp_starting;                  /* Currenlty starting threads */

       /* >0 if paused or we may open a thread, <0 if we should close a thread.
        * Updated when ltp_<finishing/pause/max_count/open_count> change.
        * Maintained to reduce the time ltp_mutex must be locked in
        * ldap_pvt_thread_pool_<submit/wrapper>().
        */
       int ltp_vary_open_count;
#      define SET_VARY_OPEN_COUNT(pool)   \
              ((pool)->ltp_vary_open_count =     \
               (pool)->ltp_pause      ?  1 :     \
               (pool)->ltp_finishing  ? -1 :     \
               ((pool)->ltp_max_count ? (pool)->ltp_max_count : LDAP_MAXTHR) \
               - (pool)->ltp_open_count)
};
static LDAP_STAILQ_HEAD ( tpq  ,
ldap_int_thread_pool_s   
) [static]

Definition at line 157 of file tpool.c.

{
       ldap_int_main_thrctx.ltu_id = ldap_pvt_thread_self();
       ldap_pvt_thread_key_create( &ldap_tpool_key );
       return ldap_pvt_thread_mutex_init(&ldap_pvt_thread_pool_mutex);
}
static void* no_task ( void ctx,
void arg 
) [static]

Definition at line 351 of file tpool.c.

{
       return NULL;
}

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Variable Documentation

ldap_int_tpool_plist_t empty_pending_list [static]
Initial value:

Definition at line 153 of file tpool.c.

Definition at line 156 of file tpool.c.

struct { ... } thread_keys[LDAP_MAXTHR] [static]