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// -*- C++ -*-
//==========================================================================
/**
* @file Thread.h
*
* $Id$
*
* @author Douglas Schmidt <schmidt@cs.wustl.edu>
*/
//==========================================================================
#ifndef ACE_THREAD_H
#define ACE_THREAD_H
#include /**/ "ace/pre.h"
#include "ace/ACE_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/OS_NS_Thread.h"
#include "ace/Thread_Adapter.h"
struct cancel_state
{
/// e.g., PTHREAD_CANCEL_ENABLE, PTHREAD_CANCEL_DISABLE,
/// PTHREAD_CANCELED.
int cancelstate;
/// e.g., PTHREAD_CANCEL_DEFERRED and PTHREAD_CANCEL_ASYNCHRONOUS.
int canceltype;
};
/**
* @class ACE_Thread
*
* @brief Provides a wrapper for threads.
*
* 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.
*/
class ACE_Export ACE_Thread
{
public:
/**
* 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, THR_EXPLICIT_SCHED,
* THR_SCOPE_SYSTEM, THR_SCOPE_PROCESS
* = 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 when <spawn>
* is called, so it must be allocated with global operator new.
*/
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);
/**
* 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 spawn()
*/
static size_t 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>). 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 spawn()
*/
static size_t 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);
/// Wait for one or more threads to exit and reap their exit status.
static int join (ACE_thread_t,
ACE_thread_t *,
ACE_THR_FUNC_RETURN *status);
/// Wait for one thread to exit and reap its exit status.
static int join (ACE_hthread_t,
ACE_THR_FUNC_RETURN * = 0);
/// Continue the execution of a previously suspended thread.
static int resume (ACE_hthread_t);
/// Suspend the execution of a particular thread.
static int suspend (ACE_hthread_t);
/// Get the priority of a particular thread.
static int getprio (ACE_hthread_t id, int &priority);
/// Get the priority and policy of a particular thread.
static int getprio (ACE_hthread_t id, int &priority, int &policy);
/// Set the priority of a particular thread.
static int setprio (ACE_hthread_t id, int priority, int policy = -1);
/// Send a signal to the thread.
static int kill (ACE_thread_t, int signum);
/// Yield the thread to another.
static void yield (void);
/**
* 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 void self (ACE_hthread_t &t_handle);
/// Return the unique ID of the thread.
static ACE_thread_t self (void);
/// Exit the current thread and return "status".
/// Should _not_ be called by main thread.
static void exit (ACE_THR_FUNC_RETURN status = 0);
/// Get the LWP concurrency level of the process.
static int getconcurrency (void);
/// Set the LWP concurrency level of the process.
static int setconcurrency (int new_level);
/// Change and/or examine calling thread's signal mask.
static int sigsetmask (int how,
const sigset_t *sigset,
sigset_t *osigset = 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 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);
/// Free up the key so that other threads can reuse it.
static int keyfree (ACE_thread_key_t key);
/// Bind value to the thread-specific data key, <key>, for the calling
/// thread.
static int setspecific (ACE_thread_key_t key,
void *value);
/// Stores the current value bound to <key> for the calling thread
/// into the location pointed to by <valuep>.
static int getspecific (ACE_thread_key_t key,
void **valuep);
/// Disable thread cancellation.
static int disablecancel (struct cancel_state *old_state);
/// Enable thread cancellation.
static int enablecancel (struct cancel_state *old_state,
int flag);
/// Set the cancellation state.
static int setcancelstate (struct cancel_state &new_state,
struct cancel_state *old_state);
/**
* Cancel a thread. Note that this method is only portable on
* platforms, such as POSIX pthreads, that support thread
* cancellation.
*/
static int cancel (ACE_thread_t t_id);
/// Test the cancel.
static void testcancel (void);
private:
/// Ensure that we don't get instantiated.
ACE_Thread (void);
};
#if defined (__ACE_INLINE__)
#include "ace/Thread.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /* ACE_THREAD_H */
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