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| -rw-r--r-- | include/uno/threadpool.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/include/uno/threadpool.h b/include/uno/threadpool.h new file mode 100644 index 0000000000..11264bd5af --- /dev/null +++ b/include/uno/threadpool.h @@ -0,0 +1,194 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +/* + * This file is part of LibreOffice published API. + */ + +#ifndef INCLUDED_UNO_THREADPOOL_H +#define INCLUDED_UNO_THREADPOOL_H + +#include "cppu/cppudllapi.h" +#include "sal/types.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/*** + * Thread identifier administration. + ***/ +/** + Establishes an association between the current thread and the given thread identifier. + There can be only one association at a time. The association must be broken by + uno_releaseIdFromCurrentThread(). + This method is in general called by a bridge, that wants to bind a remote threadId + to a new thread. + + @param pThreadId a byte sequence, that contains the identifier of the current thread. + @return true, when the identifier was registered. + false, when the thread has already an identifier. The identifier was not + altered. ( This is in general a bug ). + + @see uno_releaseIdFromCurrentThread() + */ +CPPU_DLLPUBLIC sal_Bool SAL_CALL uno_bindIdToCurrentThread( sal_Sequence *pThreadId ) + SAL_THROW_EXTERN_C(); + + +/** + Get the identifier of the current thread. + If no id has been bound for the thread before, a new one is generated and bound + to the thread. + For each call to uno_getIdOfCurrentThread(), a call to uno_releaseIdFromCurrentThread() + must be done. + + @param ppThreadId [out] Contains the (acquired) ThreadId. + @see uno_releaseIdFromCurrentThread() + */ +CPPU_DLLPUBLIC void SAL_CALL uno_getIdOfCurrentThread( sal_Sequence **ppThreadId ) + SAL_THROW_EXTERN_C(); + + +/** + If the internal refcount drops to zero, the association between threadId and + thread is broken. + */ +CPPU_DLLPUBLIC void SAL_CALL uno_releaseIdFromCurrentThread() + SAL_THROW_EXTERN_C(); + + +struct _uno_ThreadPool; +typedef struct _uno_ThreadPool * uno_ThreadPool; + +/** + Creates a threadpool handle. Typically each remote bridge instances creates one + handle. + */ +CPPU_DLLPUBLIC uno_ThreadPool SAL_CALL +uno_threadpool_create() SAL_THROW_EXTERN_C(); + + +/** + Makes the current thread known to the threadpool. This function must be + called, BEFORE uno_threadpool_enter() is called and BEFORE a job for this + thread is put into the threadpool (avoid a race between this thread and + an incoming request/reply). + For every call to uno_threadpool_attach, a corresponding call to + uno_threadpool_detach must be done. + + @param hPool The bridge threadpool handle previously created by uno_threadpool_create. + +*/ +CPPU_DLLPUBLIC void SAL_CALL +uno_threadpool_attach( uno_ThreadPool hPool ) SAL_THROW_EXTERN_C(); + +/** + This method is called to wait for a reply of a previously sent request. This is a + blocking method. uno_threadpool_attach() must have been called before. + + @param hPool the handle that was previously created by uno_threadpool_create(). + @param ppJob [out] the pointer, that was given by uno_threadpool_putJob + 0, when uno_threadpool_dispose() was the reason to fall off from threadpool. + @see uno_threadpool_dispose() + **/ +CPPU_DLLPUBLIC void SAL_CALL +uno_threadpool_enter( uno_ThreadPool hPool , void **ppJob ) + SAL_THROW_EXTERN_C(); + +/** + Detaches the current thread from the threadpool. Must be called for + every call to uno_threadpool_attach. + @param hPool the handle that was previously created by uno_threadpool_create(). +*/ +CPPU_DLLPUBLIC void SAL_CALL +uno_threadpool_detach( uno_ThreadPool hPool ) SAL_THROW_EXTERN_C(); + +/** + Puts a job into the pool. A job may either be a request or a reply + (replies have a 0 in the doRequest parameter). This function is non-blocking. + + A request may either be synchronous or asynchronous. + If the request is synchronous, it is first looked up, + if there exists a handle with the given + identifier. If this is the case, the thread is woken up and the doRequest + function is called with the given pJob. If no handle exists, + a new thread is created and the given threadId is bound to the new thread. + + If the request is asynchronous, it is put into the queue of asynchronous + requests for the current threadid. The requests are always executed in a new + thread, even if the thread with the given id is waiting in the pool. No id is bound + to the newly created thread. The responsibility is left to the bridge (if it + wishes to bind a name). + + If pJob is a reply, there MUST be a thread with the given threadId waiting + for this reply. + + @param hPool the handle that was previously created by uno_threadpool_create(). + @param pThreadId The Id of the thread, that initialized this request. (In general a + remote threadid). + @param pJob The argument, that doRequest will get or that will be returned by + uno_threadpool_enter(). + @param doRequest The function, that shall be called to execute the request. + 0 if pJob is a reply. + @param bIsOneway True, if the request is asynchronous. False, if it is synchronous. + Set to sal_False, if pJob is a reply. + */ +CPPU_DLLPUBLIC void SAL_CALL +uno_threadpool_putJob( + uno_ThreadPool hPool, + sal_Sequence *pThreadId, + void *pJob, + void ( SAL_CALL * doRequest ) ( void *pThreadSpecificData ), + sal_Bool bIsOneway ) SAL_THROW_EXTERN_C(); + +/** + All threads, that are waiting on the hPool handle, are forced out of the pool. + The threads waiting with uno_threadpool_enter() will return with *ppJob == 0 + + Later calls to uno_threadpool_enter() using the hPool handle will also + return immediately with *ppJob == 0. + + @param hPool The handle to be disposed. + + This function is called i.e. by a bridge, that is forced to dispose itself. + */ +CPPU_DLLPUBLIC void SAL_CALL +uno_threadpool_dispose( uno_ThreadPool hPool ) SAL_THROW_EXTERN_C(); + + +/** Releases the previously with uno_threadpool_create() created handle. + The handle thus becomes invalid. It is an error to use the handle after + uno_threadpool_destroy(). + + A call to uno_threadpool_destroy can synchronously join on spawned worker + threads, so this function must never be called from such a worker thread. + + @see uno_threadpool_create() + */ +CPPU_DLLPUBLIC void SAL_CALL +uno_threadpool_destroy( uno_ThreadPool hPool ) SAL_THROW_EXTERN_C(); + +#ifdef __cplusplus +} +#endif + +#endif // INCLUDED_UNO_THREADPOOL_H + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |