Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 1 | // Copyright (C) 2004-2005 Open Source Telecom Corporation. |
| 2 | // Copyright (C) 2006-2010 David Sugar, Tycho Softworks. |
| 3 | // |
| 4 | // This program is free software; you can redistribute it and/or modify |
| 5 | // it under the terms of the GNU General Public License as published by |
| 6 | // the Free Software Foundation; either version 2 of the License, or |
| 7 | // (at your option) any later version. |
| 8 | // |
| 9 | // This program is distributed in the hope that it will be useful, |
| 10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | // GNU General Public License for more details. |
| 13 | // |
| 14 | // You should have received a copy of the GNU General Public License |
| 15 | // along with this program; if not, write to the Free Software |
| 16 | // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | // |
| 18 | // As a special exception, you may use this file as part of a free software |
| 19 | // library without restriction. Specifically, if other files instantiate |
| 20 | // templates or use macros or inline functions from this file, or you compile |
| 21 | // this file and link it with other files to produce an executable, this |
| 22 | // file does not by itself cause the resulting executable to be covered by |
| 23 | // the GNU General Public License. This exception does not however |
| 24 | // invalidate any other reasons why the executable file might be covered by |
| 25 | // the GNU General Public License. |
| 26 | // |
| 27 | // This exception applies only to the code released under the name GNU |
| 28 | // Common C++. If you copy code from other releases into a copy of GNU |
| 29 | // Common C++, as the General Public License permits, the exception does |
| 30 | // not apply to the code that you add in this way. To avoid misleading |
| 31 | // anyone as to the status of such modified files, you must delete |
| 32 | // this exception notice from them. |
| 33 | // |
| 34 | // If you write modifications of your own for GNU Common C++, it is your choice |
| 35 | // whether to permit this exception to apply to your modifications. |
| 36 | // If you do not wish that, delete this exception notice. |
| 37 | // |
| 38 | |
| 39 | #include <cc++/config.h> |
| 40 | #include <cc++/export.h> |
| 41 | #include <cc++/thread.h> |
| 42 | #include <cc++/misc.h> |
| 43 | #include "private.h" |
| 44 | |
| 45 | #ifdef CCXX_NAMESPACES |
| 46 | namespace ost { |
| 47 | #endif |
| 48 | |
| 49 | Runlist::Runlist(unsigned count) : |
| 50 | Mutex() |
| 51 | { |
| 52 | first = last = NULL; |
| 53 | limit = count; |
| 54 | used = 0; |
| 55 | } |
| 56 | |
| 57 | void Runlist::del(Runable *run) |
| 58 | { |
| 59 | enter(); |
| 60 | if(run->list != this) { |
| 61 | leave(); |
| 62 | return; |
| 63 | } |
| 64 | |
| 65 | if(!run->next && !run->prev) { |
| 66 | if(first == run && last == run) |
| 67 | first = last = NULL; |
| 68 | else |
| 69 | --used; |
| 70 | run->list = NULL; |
| 71 | leave(); |
| 72 | check(); |
| 73 | return; |
| 74 | } |
| 75 | |
| 76 | if(run->next) |
| 77 | run->next->prev = run->prev; |
| 78 | else |
| 79 | last = run->prev; |
| 80 | |
| 81 | if(run->prev) |
| 82 | run->prev->next = run->next; |
| 83 | else |
| 84 | first = run->next; |
| 85 | |
| 86 | run->list = NULL; |
| 87 | run->next = run->prev = NULL; |
| 88 | leave(); |
| 89 | check(); |
| 90 | return; |
| 91 | } |
| 92 | |
| 93 | void Runlist::set(unsigned count) |
| 94 | { |
| 95 | limit = count; |
| 96 | check(); |
| 97 | } |
| 98 | |
| 99 | bool Runlist::add(Runable *run) |
| 100 | { |
| 101 | if(run->list) |
| 102 | run->list->del(run); |
| 103 | |
| 104 | run->list = this; |
| 105 | |
| 106 | enter(); |
| 107 | if(used < limit) { |
| 108 | ++used; |
| 109 | leave(); |
| 110 | return true; |
| 111 | } |
| 112 | run->next = NULL; |
| 113 | if(last) { |
| 114 | run->prev = last; |
| 115 | last = run; |
| 116 | } |
| 117 | else { |
| 118 | run->prev = NULL; |
| 119 | first = last = run; |
| 120 | } |
| 121 | leave(); |
| 122 | return false; |
| 123 | } |
| 124 | |
| 125 | void Runlist::check(void) |
| 126 | { |
| 127 | Runable *run; |
| 128 | |
| 129 | for(;;) { |
| 130 | enter(); |
| 131 | if(used >= limit || !first) { |
| 132 | leave(); |
| 133 | return; |
| 134 | } |
| 135 | run = first; |
| 136 | first = run->next; |
| 137 | if(first) |
| 138 | first->prev = NULL; |
| 139 | else |
| 140 | last = NULL; |
| 141 | run->next = run->prev = NULL; |
| 142 | if(run->list == this) |
| 143 | ++used; |
| 144 | else |
| 145 | run = NULL; |
| 146 | leave(); |
| 147 | if(run) |
| 148 | run->ready(); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | Runable::Runable() |
| 153 | { |
| 154 | list = NULL; |
| 155 | next = prev = NULL; |
| 156 | } |
| 157 | |
| 158 | bool Runable::starting(Runlist *list) |
| 159 | { |
| 160 | stoping(); |
| 161 | return list->add(this); |
| 162 | } |
| 163 | |
| 164 | void Runable::stoping(void) |
| 165 | { |
| 166 | if(list) |
| 167 | list->del(this); |
| 168 | } |
| 169 | |
| 170 | Runable::~Runable() |
| 171 | { |
| 172 | stoping(); |
| 173 | } |
| 174 | |
| 175 | #ifdef CCXX_NAMESPACES |
| 176 | } |
| 177 | #endif |
| 178 | |
| 179 | /** EMACS ** |
| 180 | * Local variables: |
| 181 | * mode: c++ |
| 182 | * c-basic-offset: 4 |
| 183 | * End: |
| 184 | */ |