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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Thread.h
//
// = AUTHOR
// Doug Schmidt
//
// ============================================================================
#ifndef ACE_THREAD_H
#define ACE_THREAD_H
#include "ace/ACE.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
class ACE_Export ACE_Thread
{
// = TITLE
// Provides a wrapper for threads.
//
// = DESCRIPTION
// This class provides a common interface that is mapped onto
// POSIX Pthreads, Solaris threads, Win32 threads, VxWorks
// threads, or pSoS threads. Note, however, that it is
// generally a better idea to use the <ACE_Thread_Manager>
// programming API rather than the <ACE_Thread> API since the
// thread manager is more powerful.
public:
static int spawn (ACE_THR_FUNC func,
void *arg = 0,
long flags = THR_NEW_LWP | THR_JOINABLE,
ACE_thread_t *t_id = 0,
ACE_hthread_t *t_handle = 0,
long priority = ACE_DEFAULT_THREAD_PRIORITY,
void *stack = 0,
size_t stack_size = 0,
ACE_Thread_Adapter *thread_adapter = 0);
// Creates a new thread having <flags> attributes and running <func>
// with <args> (if <thread_adapter> is non-0 then <func> and <args>
// are ignored and are obtained from <thread_adapter>). <thr_id>
// and <t_handle> are set to the thread's ID and handle (?),
// respectively. The thread runs at <priority> priority (see
// below).
//
// The <flags> are a bitwise-OR of the following:
// = BEGIN<INDENT>
// THR_CANCEL_DISABLE, THR_CANCEL_ENABLE, THR_CANCEL_DEFERRED,
// THR_CANCEL_ASYNCHRONOUS, THR_BOUND, THR_NEW_LWP, THR_DETACHED,
// THR_SUSPENDED, THR_DAEMON, THR_JOINABLE, THR_SCHED_FIFO,
// THR_SCHED_RR, THR_SCHED_DEFAULT
// = END<INDENT>
//
// By default, or if <priority> is set to
// ACE_DEFAULT_THREAD_PRIORITY, an "appropriate" priority value for
// the given scheduling policy (specified in <flags}>, e.g.,
// <THR_SCHED_DEFAULT>) is used. This value is calculated
// dynamically, and is the median value between the minimum and
// maximum priority values for the given policy. If an explicit
// value is given, it is used. Note that actual priority values are
// EXTREMEMLY implementation-dependent, and are probably best
// avoided.
//
// Note that <thread_adapter> is always deleted by <thr_create>,
// therefore it must be allocated with global operator new.
static int spawn_n (size_t n,
ACE_THR_FUNC func,
void *arg = 0,
long flags = THR_NEW_LWP | THR_JOINABLE,
long priority = ACE_DEFAULT_THREAD_PRIORITY,
void *stack[] = 0,
size_t stack_size[] = 0,
ACE_Thread_Adapter *thread_adapter = 0);
// Spawn N new threads, which execute <func> with argument <arg> (if
// <thread_adapter> is non-0 then <func> and <args> are ignored and
// are obtained from <thread_adapter>). If <stack> != 0 it is
// assumed to be an array of <n> pointers to the base of the stacks
// to use for the threads being spawned. Likewise, if <stack_size>
// != 0 it is assumed to be an array of <n> values indicating how
// big each of the corresponding <stack>s are. Returns the number
// of threads actually spawned (if this doesn't equal the number
// requested then something has gone wrong and <errno> will
// explain...).
//
// See also <spawn>.
static int spawn_n (ACE_thread_t thread_ids[],
size_t n,
ACE_THR_FUNC func,
void *arg,
long flags,
long priority = ACE_DEFAULT_THREAD_PRIORITY,
void *stack[] = 0,
size_t stack_size[] = 0,
ACE_hthread_t thread_handles[] = 0,
ACE_Thread_Adapter *thread_adapter = 0);
// Spawn <n> new threads, which execute <func> with argument <arg>
// (if <thread_adapter> is non-0 then <func> and <args> are ignored
// and are obtained from <thread_adapter>). The thread_ids of
// successfully spawned threads will be placed into the <thread_ids>
// buffer (which must be the same size as <n>). If <stack> != 0 it
// is assumed to be an array of <n> pointers to the base of the
// stacks to use for the threads being spawned. If <stack_size> !=
// 0 it is assumed to be an array of <n> values indicating how big
// each of the corresponding <stack>s are. If <thread_handles> != 0
// it is assumed to be an array of <n> thread_handles that will be
// assigned the values of the thread handles being spawned. Returns
// the number of threads actually spawned (if this doesn't equal the
// number requested then something has gone wrong and <errno> will
// explain...).
//
// See also <spawn>.
static int join (ACE_thread_t,
ACE_thread_t *,
void **status = 0);
// Wait for one or more threads to exit.
static int join (ACE_hthread_t,
void ** = 0);
// Wait for one thread to exit.
static int resume (ACE_hthread_t);
// Continue the execution of a previously suspended thread.
static int suspend (ACE_hthread_t);
// Suspend the execution of a particular thread.
static int getprio (ACE_hthread_t, int &prio);
// Get the priority of a particular thread.
static int setprio (ACE_hthread_t, int prio);
// Set the priority of a particular thread.
static int kill (ACE_thread_t, int signum);
// Send a signal to the thread.
static void yield (void);
// Yield the thread to another.
static void self (ACE_hthread_t &t_handle);
// Return the unique kernel handle of the thread. Note that on
// Win32 this is actually a pseudohandle, which cannot be shared
// with other processes or waited on by threads. To locate the real
// handle, please use the <ACE_Thread_Manager::thr_self> method.
static ACE_thread_t self (void);
// Return the unique ID of the thread.
static void exit (void *status = 0);
// Exit the current thread and return "status".
// Should _not_ be called by main thread.
static int getconcurrency (void);
// Get the LWP concurrency level of the process.
static int setconcurrency (int new_level);
// Set the LWP concurrency level of the process.
static int sigsetmask (int how,
const sigset_t *sigset,
sigset_t *osigset = 0);
// Change and/or examine calling thread's signal mask.
static int keycreate (ACE_thread_key_t *keyp,
#if defined (ACE_HAS_THR_C_DEST)
ACE_THR_C_DEST destructor,
#else
ACE_THR_DEST destructor,
#endif /* ACE_HAS_THR_C_DEST */
void * = 0);
// Allocates a <keyp> that is used to identify data that is specific
// to each thread in the process. The key is global to all threads
// in the process.
static int keyfree (ACE_thread_key_t key);
// Free up the key so that other threads can reuse it.
static int setspecific (ACE_thread_key_t key,
void *value);
// Bind value to the thread-specific data key, <key>, for the calling
// thread.
static int getspecific (ACE_thread_key_t key,
void **valuep);
// Stores the current value bound to <key> for the calling thread
// into the location pointed to by <valuep>.
static int disablecancel (struct cancel_state *old_state);
// Disable thread cancellation.
static int enablecancel (struct cancel_state *old_state,
int flag);
// Enable thread cancellation.
static int setcancelstate (struct cancel_state &new_state,
struct cancel_state *old_state);
// Set the cancellation state.
static int cancel (ACE_thread_t t_id);
// Cancel a thread. Note that this method is only portable on
// platforms, such as POSIX pthreads, that support thread
// cancellation.
static void testcancel (void);
// Test the cancel.
private:
ACE_Thread (void);
// Ensure that we don't get instantiated.
};
#if defined (__ACE_INLINE__)
#include "ace/Thread.i"
#endif /* __ACE_INLINE__ */
#endif /* ACE_THREAD_H */
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