mirror of
https://github.com/outbackdingo/UltraGrid.git
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284 lines
8.6 KiB
C++
284 lines
8.6 KiB
C++
/*
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* FILE: utils/resource_manager.h
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* AUTHORS: Martin Benes <martinbenesh@gmail.com>
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* Lukas Hejtmanek <xhejtman@ics.muni.cz>
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* Petr Holub <hopet@ics.muni.cz>
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* Milos Liska <xliska@fi.muni.cz>
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* Jiri Matela <matela@ics.muni.cz>
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* Dalibor Matura <255899@mail.muni.cz>
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* Ian Wesley-Smith <iwsmith@cct.lsu.edu>
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*
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* Copyright (c) 2005-2010 CESNET z.s.p.o.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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*
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* This product includes software developed by CESNET z.s.p.o.
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*
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* 4. Neither the name of the CESNET nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#include "config_unix.h"
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#include "config_win32.h"
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#endif // HAVE_CONFIG_H
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#include "resource_manager.h"
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#include <map>
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#include <stdexcept>
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#include <string>
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#include <typeinfo>
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#include <utility>
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#define TYPE_LOCK 0
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#define TYPE_SHM 1
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typedef int type_t;
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using namespace std;
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// prototypes
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static pthread_mutex_t *rm_acquire_shared_lock_real(const char *name);
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static void rm_release_shared_lock_real(const char *name);
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static void rm_lock_real();
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static void rm_unlock_real();
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static void *rm_get_shm_real(const char *name, int size);
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// functon pointers' assignments
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pthread_mutex_t *(*rm_acquire_shared_lock)(const char *name) =
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rm_acquire_shared_lock_real;
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void (*rm_release_shared_lock)(const char *name) =
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rm_release_shared_lock_real;
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void (*rm_lock)() = rm_lock_real;
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void (*rm_unlock)() = rm_unlock_real;
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void *(*rm_get_shm)(const char *name, int size) = rm_get_shm_real;
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class options_t {
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public:
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virtual ~options_t() {}
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};
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class no_opts : public options_t {
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};
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class shm_opts : public options_t {
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public:
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shm_opts(int size) : m_size(size) {}
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private:
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int m_size;
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friend class shm;
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};
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class resource {
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public:
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virtual ~resource() {}
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static resource *create(type_t type, options_t const & options);
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static string get_suffix(type_t type);
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};
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class lock : public resource {
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public:
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lock() {
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pthread_mutex_init(&m_lock, NULL);
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}
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~lock() {
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pthread_mutex_destroy(&m_lock);
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}
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pthread_mutex_t *get() {
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return &m_lock;
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}
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private:
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pthread_mutex_t m_lock;
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};
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class shm : public resource {
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public:
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shm(shm_opts const &opts) {
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m_data = calloc(1, opts.m_size);
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}
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~shm() {
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free(m_data);
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}
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void *get() {
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return m_data;
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}
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private:
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void *m_data;
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};
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class lock_holder {
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public:
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lock_holder(pthread_mutex_t lock) :
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m_lock(lock)
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{
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pthread_mutex_lock(&m_lock);
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}
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~lock_holder()
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{
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pthread_mutex_unlock(&m_lock);
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}
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private:
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pthread_mutex_t &m_lock;
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};
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class resource_manager_t {
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public:
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typedef map<string, pair<resource *, int> > obj_map_t;
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resource_manager_t() {
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pthread_mutex_init(&m_access_lock, NULL);
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pthread_mutex_init(&m_excl_lock, NULL);
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}
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~resource_manager_t() {
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pthread_mutex_destroy(&m_access_lock);
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pthread_mutex_destroy(&m_excl_lock);
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}
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void lock() {
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pthread_mutex_lock(&m_excl_lock);
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}
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void unlock() {
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pthread_mutex_unlock(&m_excl_lock);
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}
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resource *acquire(string name, type_t type, options_t const & options) {
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resource *ret;
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lock_holder lock(m_access_lock);
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string item_name = name + "#" + resource::get_suffix(type);
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obj_map_t::iterator it = m_objs.find(item_name);
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if(it == m_objs.end()) {
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// create
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ret = resource::create(type, options);
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m_objs[item_name] = pair<resource *, int>(ret,
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1);
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} else {
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it->second.second += 1;
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ret = it->second.first;
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}
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return ret;
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}
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void release(string name, type_t type) {
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lock_holder lock(m_access_lock);
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string item_name = name + "#" + resource::get_suffix(type);
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obj_map_t::iterator it = m_objs.find(item_name);
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if(it == m_objs.end()) {
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// create
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throw logic_error("Not such object.");
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} else {
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it->second.second -= 1;
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if(it->second.second == 0) { // ref count == 0
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delete it->second.first;
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m_objs.erase(it);
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}
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}
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}
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private:
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pthread_mutex_t m_access_lock;
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pthread_mutex_t m_excl_lock;
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obj_map_t m_objs;
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};
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static resource_manager_t resource_manager;
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resource *resource::create(type_t type, options_t const & options)
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{
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if(type == TYPE_LOCK) {
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return new lock;
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} else if(type == TYPE_SHM) {
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return new shm(dynamic_cast<const shm_opts &>(options));
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} else {
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throw logic_error("Wrong typeid");
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}
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}
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string resource::get_suffix(type_t type)
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{
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if(type == TYPE_LOCK) {
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return string("mutex");
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} else if(type == TYPE_SHM) {
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return string("SHM");
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} else {
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throw logic_error("Wrong typeid");
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}
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}
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static pthread_mutex_t *rm_acquire_shared_lock_real(const char *name)
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{
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lock *l = dynamic_cast<lock *>(resource_manager.acquire(
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string(name), TYPE_LOCK, no_opts()));
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if(l) {
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return l->get();
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} else {
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return NULL;
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}
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}
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static void rm_release_shared_lock_real(const char *name)
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{
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resource_manager.release(string(name), TYPE_LOCK);
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}
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void rm_lock_real()
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{
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resource_manager.lock();
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}
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void rm_unlock_real()
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{
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resource_manager.unlock();
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}
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void *rm_get_shm_real(const char *name, int size)
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{
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shm *s = dynamic_cast<shm *>(resource_manager.acquire(
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string(name), TYPE_SHM, shm_opts(size)));
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if(s) {
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return s->get();
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} else {
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return NULL;
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}
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}
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