linuxthreads/sysdeps/pthread/bits/pthreadtypes.h

   1 /* Linuxthreads - a simple clone()-based implementation of Posix        */
   2 /* threads for Linux.                                                   */
   3 /* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr)              */
   4 /*                                                                      */
   5 /* This program is free software; you can redistribute it and/or        */
   6 /* modify it under the terms of the GNU Library General Public License  */
   7 /* as published by the Free Software Foundation; either version 2       */
   8 /* of the License, or (at your option) any later version.               */
   9 /*                                                                      */
  10 /* This program is distributed in the hope that it will be useful,      */
  11 /* but WITHOUT ANY WARRANTY; without even the implied warranty of       */
  12 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        */
  13 /* GNU Library General Public License for more details.                 */
  14
  15 #if !defined _BITS_TYPES_H && !defined _PTHREAD_H
  16 # error "Never include <bits/pthreadtypes.h> directly; use <sys/types.h> instead."
  17 #endif
  18
  19 #ifndef _BITS_PTHREADTYPES_H
  20 #define _BITS_PTHREADTYPES_H    1
  21
  22 #define __need_schedparam
  23 #include <bits/sched.h>
  24
  25 /* Fast locks (not abstract because mutexes and conditions aren't abstract). */
  26 struct _pthread_fastlock
  27 {
  28   long int __status;            /* "Free" or "taken" or head of waiting list */
  29   int __spinlock;               /* For compare-and-swap emulation */
  30 };
  31
  32 /* Thread descriptors */
  33 typedef struct _pthread_descr_struct *_pthread_descr;
  34
  35
  36 /* Attributes for threads.  */
  37 typedef struct
  38 {
  39   int __detachstate;
  40   int __schedpolicy;
  41   struct __sched_param __schedparam;
  42   int __inheritsched;
  43   int __scope;
  44   size_t __guardsize;
  45   int __stackaddr_set;
  46   void *__stackaddr;
  47   size_t __stacksize;
  48 } pthread_attr_t;
  49
  50
  51 /* Conditions (not abstract because of PTHREAD_COND_INITIALIZER */
  52 typedef struct
  53 {
  54   struct _pthread_fastlock __c_lock; /* Protect against concurrent access */
  55   _pthread_descr __c_waiting;        /* Threads waiting on this condition */
  56 } pthread_cond_t;
  57
  58
  59 /* Attribute for conditionally variables.  */
  60 typedef struct
  61 {
  62   int __dummy;
  63 } pthread_condattr_t;
  64
  65 /* Keys for thread-specific data */
  66 typedef unsigned int pthread_key_t;
  67
  68
  69 /* Mutexes (not abstract because of PTHREAD_MUTEX_INITIALIZER).  */
  70 /* (The layout is unnatural to maintain binary compatibility
  71     with earlier releases of LinuxThreads.) */
  72 typedef struct
  73 {
  74   int __m_reserved;               /* Reserved for future use */
  75   int __m_count;                  /* Depth of recursive locking */
  76   _pthread_descr __m_owner;       /* Owner thread (if recursive or errcheck) */
  77   int __m_kind;                   /* Mutex kind: fast, recursive or errcheck */
  78   struct _pthread_fastlock __m_lock; /* Underlying fast lock */
  79 } pthread_mutex_t;
  80
  81
  82 /* Attribute for mutex.  */
  83 typedef struct
  84 {
  85   int __mutexkind;
  86 } pthread_mutexattr_t;
  87
  88
  89 /* Once-only execution */
  90 typedef int pthread_once_t;
  91
  92
  93 #ifdef __USE_UNIX98
  94 /* Read-write locks.  */
  95 typedef struct
  96 {
  97   struct _pthread_fastlock __rw_lock; /* Lock to guarantee mutual exclusion */
  98   int __rw_readers;                   /* Number of readers */
  99   _pthread_descr __rw_writer;         /* Identity of writer, or NULL if none */
 100   _pthread_descr __rw_read_waiting;   /* Threads waiting for reading */
 101   _pthread_descr __rw_write_waiting;  /* Threads waiting for writing */
 102   int __rw_kind;                      /* Reader/Writer preference selection */
 103   int __rw_pshared;                   /* Shared between processes or not */
 104 } pthread_rwlock_t;
 105
 106
 107 /* Attribute for read-write locks.  */
 108 typedef struct
 109 {
 110   int __lockkind;
 111   int __pshared;
 112 } pthread_rwlockattr_t;
 113 #endif
 114
 115
 116 /* Thread identifiers */
 117 typedef unsigned long int pthread_t;
 118
 119 #endif  /* bits/pthreadtypes.h */