Steven He
/
StringMatchingProtothread
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pt.h@0:544b5f6ad832, 2010-12-01 (annotated)
- Committer:
- StevenHe
- Date:
- Wed Dec 01 04:39:00 2010 +0000
- Revision:
- 0:544b5f6ad832
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| StevenHe | 0:544b5f6ad832 | 1 | /* |
| StevenHe | 0:544b5f6ad832 | 2 | * Copyright (c) 2004-2005, Swedish Institute of Computer Science. |
| StevenHe | 0:544b5f6ad832 | 3 | * All rights reserved. |
| StevenHe | 0:544b5f6ad832 | 4 | * |
| StevenHe | 0:544b5f6ad832 | 5 | * Redistribution and use in source and binary forms, with or without |
| StevenHe | 0:544b5f6ad832 | 6 | * modification, are permitted provided that the following conditions |
| StevenHe | 0:544b5f6ad832 | 7 | * are met: |
| StevenHe | 0:544b5f6ad832 | 8 | * 1. Redistributions of source code must retain the above copyright |
| StevenHe | 0:544b5f6ad832 | 9 | * notice, this list of conditions and the following disclaimer. |
| StevenHe | 0:544b5f6ad832 | 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| StevenHe | 0:544b5f6ad832 | 11 | * notice, this list of conditions and the following disclaimer in the |
| StevenHe | 0:544b5f6ad832 | 12 | * documentation and/or other materials provided with the distribution. |
| StevenHe | 0:544b5f6ad832 | 13 | * 3. Neither the name of the Institute nor the names of its contributors |
| StevenHe | 0:544b5f6ad832 | 14 | * may be used to endorse or promote products derived from this software |
| StevenHe | 0:544b5f6ad832 | 15 | * without specific prior written permission. |
| StevenHe | 0:544b5f6ad832 | 16 | * |
| StevenHe | 0:544b5f6ad832 | 17 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND |
| StevenHe | 0:544b5f6ad832 | 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| StevenHe | 0:544b5f6ad832 | 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| StevenHe | 0:544b5f6ad832 | 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE |
| StevenHe | 0:544b5f6ad832 | 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| StevenHe | 0:544b5f6ad832 | 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| StevenHe | 0:544b5f6ad832 | 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| StevenHe | 0:544b5f6ad832 | 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| StevenHe | 0:544b5f6ad832 | 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| StevenHe | 0:544b5f6ad832 | 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| StevenHe | 0:544b5f6ad832 | 27 | * SUCH DAMAGE. |
| StevenHe | 0:544b5f6ad832 | 28 | * |
| StevenHe | 0:544b5f6ad832 | 29 | * This file is part of the Contiki operating system. |
| StevenHe | 0:544b5f6ad832 | 30 | * |
| StevenHe | 0:544b5f6ad832 | 31 | * Author: Adam Dunkels <adam@sics.se> |
| StevenHe | 0:544b5f6ad832 | 32 | * |
| StevenHe | 0:544b5f6ad832 | 33 | * $Id: pt.h,v 1.7 2006/10/02 07:52:56 adam Exp $ |
| StevenHe | 0:544b5f6ad832 | 34 | */ |
| StevenHe | 0:544b5f6ad832 | 35 | |
| StevenHe | 0:544b5f6ad832 | 36 | /** |
| StevenHe | 0:544b5f6ad832 | 37 | * \addtogroup pt |
| StevenHe | 0:544b5f6ad832 | 38 | * @{ |
| StevenHe | 0:544b5f6ad832 | 39 | */ |
| StevenHe | 0:544b5f6ad832 | 40 | |
| StevenHe | 0:544b5f6ad832 | 41 | /** |
| StevenHe | 0:544b5f6ad832 | 42 | * \file |
| StevenHe | 0:544b5f6ad832 | 43 | * Protothreads implementation. |
| StevenHe | 0:544b5f6ad832 | 44 | * \author |
| StevenHe | 0:544b5f6ad832 | 45 | * Adam Dunkels <adam@sics.se> |
| StevenHe | 0:544b5f6ad832 | 46 | * |
| StevenHe | 0:544b5f6ad832 | 47 | */ |
| StevenHe | 0:544b5f6ad832 | 48 | |
| StevenHe | 0:544b5f6ad832 | 49 | #ifndef __PT_H__ |
| StevenHe | 0:544b5f6ad832 | 50 | #define __PT_H__ |
| StevenHe | 0:544b5f6ad832 | 51 | |
| StevenHe | 0:544b5f6ad832 | 52 | #include "lc.h" |
| StevenHe | 0:544b5f6ad832 | 53 | |
| StevenHe | 0:544b5f6ad832 | 54 | struct pt { |
| StevenHe | 0:544b5f6ad832 | 55 | lc_t lc; |
| StevenHe | 0:544b5f6ad832 | 56 | }; |
| StevenHe | 0:544b5f6ad832 | 57 | |
| StevenHe | 0:544b5f6ad832 | 58 | #define PT_WAITING 0 |
| StevenHe | 0:544b5f6ad832 | 59 | #define PT_YIELDED 1 |
| StevenHe | 0:544b5f6ad832 | 60 | #define PT_EXITED 2 |
| StevenHe | 0:544b5f6ad832 | 61 | #define PT_ENDED 3 |
| StevenHe | 0:544b5f6ad832 | 62 | |
| StevenHe | 0:544b5f6ad832 | 63 | /** |
| StevenHe | 0:544b5f6ad832 | 64 | * \name Initialization |
| StevenHe | 0:544b5f6ad832 | 65 | * @{ |
| StevenHe | 0:544b5f6ad832 | 66 | */ |
| StevenHe | 0:544b5f6ad832 | 67 | |
| StevenHe | 0:544b5f6ad832 | 68 | /** |
| StevenHe | 0:544b5f6ad832 | 69 | * Initialize a protothread. |
| StevenHe | 0:544b5f6ad832 | 70 | * |
| StevenHe | 0:544b5f6ad832 | 71 | * Initializes a protothread. Initialization must be done prior to |
| StevenHe | 0:544b5f6ad832 | 72 | * starting to execute the protothread. |
| StevenHe | 0:544b5f6ad832 | 73 | * |
| StevenHe | 0:544b5f6ad832 | 74 | * \param pt A pointer to the protothread control structure. |
| StevenHe | 0:544b5f6ad832 | 75 | * |
| StevenHe | 0:544b5f6ad832 | 76 | * \sa PT_SPAWN() |
| StevenHe | 0:544b5f6ad832 | 77 | * |
| StevenHe | 0:544b5f6ad832 | 78 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 79 | */ |
| StevenHe | 0:544b5f6ad832 | 80 | #define PT_INIT(pt) LC_INIT((pt)->lc) |
| StevenHe | 0:544b5f6ad832 | 81 | |
| StevenHe | 0:544b5f6ad832 | 82 | /** @} */ |
| StevenHe | 0:544b5f6ad832 | 83 | |
| StevenHe | 0:544b5f6ad832 | 84 | /** |
| StevenHe | 0:544b5f6ad832 | 85 | * \name Declaration and definition |
| StevenHe | 0:544b5f6ad832 | 86 | * @{ |
| StevenHe | 0:544b5f6ad832 | 87 | */ |
| StevenHe | 0:544b5f6ad832 | 88 | |
| StevenHe | 0:544b5f6ad832 | 89 | /** |
| StevenHe | 0:544b5f6ad832 | 90 | * Declaration of a protothread. |
| StevenHe | 0:544b5f6ad832 | 91 | * |
| StevenHe | 0:544b5f6ad832 | 92 | * This macro is used to declare a protothread. All protothreads must |
| StevenHe | 0:544b5f6ad832 | 93 | * be declared with this macro. |
| StevenHe | 0:544b5f6ad832 | 94 | * |
| StevenHe | 0:544b5f6ad832 | 95 | * \param name_args The name and arguments of the C function |
| StevenHe | 0:544b5f6ad832 | 96 | * implementing the protothread. |
| StevenHe | 0:544b5f6ad832 | 97 | * |
| StevenHe | 0:544b5f6ad832 | 98 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 99 | */ |
| StevenHe | 0:544b5f6ad832 | 100 | #define PT_THREAD(name_args) char name_args |
| StevenHe | 0:544b5f6ad832 | 101 | |
| StevenHe | 0:544b5f6ad832 | 102 | /** |
| StevenHe | 0:544b5f6ad832 | 103 | * Declare the start of a protothread inside the C function |
| StevenHe | 0:544b5f6ad832 | 104 | * implementing the protothread. |
| StevenHe | 0:544b5f6ad832 | 105 | * |
| StevenHe | 0:544b5f6ad832 | 106 | * This macro is used to declare the starting point of a |
| StevenHe | 0:544b5f6ad832 | 107 | * protothread. It should be placed at the start of the function in |
| StevenHe | 0:544b5f6ad832 | 108 | * which the protothread runs. All C statements above the PT_BEGIN() |
| StevenHe | 0:544b5f6ad832 | 109 | * invokation will be executed each time the protothread is scheduled. |
| StevenHe | 0:544b5f6ad832 | 110 | * |
| StevenHe | 0:544b5f6ad832 | 111 | * \param pt A pointer to the protothread control structure. |
| StevenHe | 0:544b5f6ad832 | 112 | * |
| StevenHe | 0:544b5f6ad832 | 113 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 114 | */ |
| StevenHe | 0:544b5f6ad832 | 115 | #define PT_BEGIN(pt) { char PT_YIELD_FLAG = 1; LC_RESUME((pt)->lc) |
| StevenHe | 0:544b5f6ad832 | 116 | |
| StevenHe | 0:544b5f6ad832 | 117 | /** |
| StevenHe | 0:544b5f6ad832 | 118 | * Declare the end of a protothread. |
| StevenHe | 0:544b5f6ad832 | 119 | * |
| StevenHe | 0:544b5f6ad832 | 120 | * This macro is used for declaring that a protothread ends. It must |
| StevenHe | 0:544b5f6ad832 | 121 | * always be used together with a matching PT_BEGIN() macro. |
| StevenHe | 0:544b5f6ad832 | 122 | * |
| StevenHe | 0:544b5f6ad832 | 123 | * \param pt A pointer to the protothread control structure. |
| StevenHe | 0:544b5f6ad832 | 124 | * |
| StevenHe | 0:544b5f6ad832 | 125 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 126 | */ |
| StevenHe | 0:544b5f6ad832 | 127 | #define PT_END(pt) LC_END((pt)->lc); PT_YIELD_FLAG = 0; \ |
| StevenHe | 0:544b5f6ad832 | 128 | PT_INIT(pt); return PT_ENDED; } |
| StevenHe | 0:544b5f6ad832 | 129 | |
| StevenHe | 0:544b5f6ad832 | 130 | /** @} */ |
| StevenHe | 0:544b5f6ad832 | 131 | |
| StevenHe | 0:544b5f6ad832 | 132 | /** |
| StevenHe | 0:544b5f6ad832 | 133 | * \name Blocked wait |
| StevenHe | 0:544b5f6ad832 | 134 | * @{ |
| StevenHe | 0:544b5f6ad832 | 135 | */ |
| StevenHe | 0:544b5f6ad832 | 136 | |
| StevenHe | 0:544b5f6ad832 | 137 | /** |
| StevenHe | 0:544b5f6ad832 | 138 | * Block and wait until condition is true. |
| StevenHe | 0:544b5f6ad832 | 139 | * |
| StevenHe | 0:544b5f6ad832 | 140 | * This macro blocks the protothread until the specified condition is |
| StevenHe | 0:544b5f6ad832 | 141 | * true. |
| StevenHe | 0:544b5f6ad832 | 142 | * |
| StevenHe | 0:544b5f6ad832 | 143 | * \param pt A pointer to the protothread control structure. |
| StevenHe | 0:544b5f6ad832 | 144 | * \param condition The condition. |
| StevenHe | 0:544b5f6ad832 | 145 | * |
| StevenHe | 0:544b5f6ad832 | 146 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 147 | */ |
| StevenHe | 0:544b5f6ad832 | 148 | #define PT_WAIT_UNTIL(pt, condition) \ |
| StevenHe | 0:544b5f6ad832 | 149 | do { \ |
| StevenHe | 0:544b5f6ad832 | 150 | LC_SET((pt)->lc); \ |
| StevenHe | 0:544b5f6ad832 | 151 | if(!(condition)) { \ |
| StevenHe | 0:544b5f6ad832 | 152 | return PT_WAITING; \ |
| StevenHe | 0:544b5f6ad832 | 153 | } \ |
| StevenHe | 0:544b5f6ad832 | 154 | } while(0) |
| StevenHe | 0:544b5f6ad832 | 155 | |
| StevenHe | 0:544b5f6ad832 | 156 | /** |
| StevenHe | 0:544b5f6ad832 | 157 | * Block and wait while condition is true. |
| StevenHe | 0:544b5f6ad832 | 158 | * |
| StevenHe | 0:544b5f6ad832 | 159 | * This function blocks and waits while condition is true. See |
| StevenHe | 0:544b5f6ad832 | 160 | * PT_WAIT_UNTIL(). |
| StevenHe | 0:544b5f6ad832 | 161 | * |
| StevenHe | 0:544b5f6ad832 | 162 | * \param pt A pointer to the protothread control structure. |
| StevenHe | 0:544b5f6ad832 | 163 | * \param cond The condition. |
| StevenHe | 0:544b5f6ad832 | 164 | * |
| StevenHe | 0:544b5f6ad832 | 165 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 166 | */ |
| StevenHe | 0:544b5f6ad832 | 167 | #define PT_WAIT_WHILE(pt, cond) PT_WAIT_UNTIL((pt), !(cond)) |
| StevenHe | 0:544b5f6ad832 | 168 | |
| StevenHe | 0:544b5f6ad832 | 169 | /** @} */ |
| StevenHe | 0:544b5f6ad832 | 170 | |
| StevenHe | 0:544b5f6ad832 | 171 | /** |
| StevenHe | 0:544b5f6ad832 | 172 | * \name Hierarchical protothreads |
| StevenHe | 0:544b5f6ad832 | 173 | * @{ |
| StevenHe | 0:544b5f6ad832 | 174 | */ |
| StevenHe | 0:544b5f6ad832 | 175 | |
| StevenHe | 0:544b5f6ad832 | 176 | /** |
| StevenHe | 0:544b5f6ad832 | 177 | * Block and wait until a child protothread completes. |
| StevenHe | 0:544b5f6ad832 | 178 | * |
| StevenHe | 0:544b5f6ad832 | 179 | * This macro schedules a child protothread. The current protothread |
| StevenHe | 0:544b5f6ad832 | 180 | * will block until the child protothread completes. |
| StevenHe | 0:544b5f6ad832 | 181 | * |
| StevenHe | 0:544b5f6ad832 | 182 | * \note The child protothread must be manually initialized with the |
| StevenHe | 0:544b5f6ad832 | 183 | * PT_INIT() function before this function is used. |
| StevenHe | 0:544b5f6ad832 | 184 | * |
| StevenHe | 0:544b5f6ad832 | 185 | * \param pt A pointer to the protothread control structure. |
| StevenHe | 0:544b5f6ad832 | 186 | * \param thread The child protothread with arguments |
| StevenHe | 0:544b5f6ad832 | 187 | * |
| StevenHe | 0:544b5f6ad832 | 188 | * \sa PT_SPAWN() |
| StevenHe | 0:544b5f6ad832 | 189 | * |
| StevenHe | 0:544b5f6ad832 | 190 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 191 | */ |
| StevenHe | 0:544b5f6ad832 | 192 | #define PT_WAIT_THREAD(pt, thread) PT_WAIT_WHILE((pt), PT_SCHEDULE(thread)) |
| StevenHe | 0:544b5f6ad832 | 193 | |
| StevenHe | 0:544b5f6ad832 | 194 | /** |
| StevenHe | 0:544b5f6ad832 | 195 | * Spawn a child protothread and wait until it exits. |
| StevenHe | 0:544b5f6ad832 | 196 | * |
| StevenHe | 0:544b5f6ad832 | 197 | * This macro spawns a child protothread and waits until it exits. The |
| StevenHe | 0:544b5f6ad832 | 198 | * macro can only be used within a protothread. |
| StevenHe | 0:544b5f6ad832 | 199 | * |
| StevenHe | 0:544b5f6ad832 | 200 | * \param pt A pointer to the protothread control structure. |
| StevenHe | 0:544b5f6ad832 | 201 | * \param child A pointer to the child protothread's control structure. |
| StevenHe | 0:544b5f6ad832 | 202 | * \param thread The child protothread with arguments |
| StevenHe | 0:544b5f6ad832 | 203 | * |
| StevenHe | 0:544b5f6ad832 | 204 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 205 | */ |
| StevenHe | 0:544b5f6ad832 | 206 | #define PT_SPAWN(pt, child, thread) \ |
| StevenHe | 0:544b5f6ad832 | 207 | do { \ |
| StevenHe | 0:544b5f6ad832 | 208 | PT_INIT((child)); \ |
| StevenHe | 0:544b5f6ad832 | 209 | PT_WAIT_THREAD((pt), (thread)); \ |
| StevenHe | 0:544b5f6ad832 | 210 | } while(0) |
| StevenHe | 0:544b5f6ad832 | 211 | |
| StevenHe | 0:544b5f6ad832 | 212 | /** @} */ |
| StevenHe | 0:544b5f6ad832 | 213 | |
| StevenHe | 0:544b5f6ad832 | 214 | /** |
| StevenHe | 0:544b5f6ad832 | 215 | * \name Exiting and restarting |
| StevenHe | 0:544b5f6ad832 | 216 | * @{ |
| StevenHe | 0:544b5f6ad832 | 217 | */ |
| StevenHe | 0:544b5f6ad832 | 218 | |
| StevenHe | 0:544b5f6ad832 | 219 | /** |
| StevenHe | 0:544b5f6ad832 | 220 | * Restart the protothread. |
| StevenHe | 0:544b5f6ad832 | 221 | * |
| StevenHe | 0:544b5f6ad832 | 222 | * This macro will block and cause the running protothread to restart |
| StevenHe | 0:544b5f6ad832 | 223 | * its execution at the place of the PT_BEGIN() call. |
| StevenHe | 0:544b5f6ad832 | 224 | * |
| StevenHe | 0:544b5f6ad832 | 225 | * \param pt A pointer to the protothread control structure. |
| StevenHe | 0:544b5f6ad832 | 226 | * |
| StevenHe | 0:544b5f6ad832 | 227 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 228 | */ |
| StevenHe | 0:544b5f6ad832 | 229 | #define PT_RESTART(pt) \ |
| StevenHe | 0:544b5f6ad832 | 230 | do { \ |
| StevenHe | 0:544b5f6ad832 | 231 | PT_INIT(pt); \ |
| StevenHe | 0:544b5f6ad832 | 232 | return PT_WAITING; \ |
| StevenHe | 0:544b5f6ad832 | 233 | } while(0) |
| StevenHe | 0:544b5f6ad832 | 234 | |
| StevenHe | 0:544b5f6ad832 | 235 | /** |
| StevenHe | 0:544b5f6ad832 | 236 | * Exit the protothread. |
| StevenHe | 0:544b5f6ad832 | 237 | * |
| StevenHe | 0:544b5f6ad832 | 238 | * This macro causes the protothread to exit. If the protothread was |
| StevenHe | 0:544b5f6ad832 | 239 | * spawned by another protothread, the parent protothread will become |
| StevenHe | 0:544b5f6ad832 | 240 | * unblocked and can continue to run. |
| StevenHe | 0:544b5f6ad832 | 241 | * |
| StevenHe | 0:544b5f6ad832 | 242 | * \param pt A pointer to the protothread control structure. |
| StevenHe | 0:544b5f6ad832 | 243 | * |
| StevenHe | 0:544b5f6ad832 | 244 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 245 | */ |
| StevenHe | 0:544b5f6ad832 | 246 | #define PT_EXIT(pt) \ |
| StevenHe | 0:544b5f6ad832 | 247 | do { \ |
| StevenHe | 0:544b5f6ad832 | 248 | PT_INIT(pt); \ |
| StevenHe | 0:544b5f6ad832 | 249 | return PT_EXITED; \ |
| StevenHe | 0:544b5f6ad832 | 250 | } while(0) |
| StevenHe | 0:544b5f6ad832 | 251 | |
| StevenHe | 0:544b5f6ad832 | 252 | /** @} */ |
| StevenHe | 0:544b5f6ad832 | 253 | |
| StevenHe | 0:544b5f6ad832 | 254 | /** |
| StevenHe | 0:544b5f6ad832 | 255 | * \name Calling a protothread |
| StevenHe | 0:544b5f6ad832 | 256 | * @{ |
| StevenHe | 0:544b5f6ad832 | 257 | */ |
| StevenHe | 0:544b5f6ad832 | 258 | |
| StevenHe | 0:544b5f6ad832 | 259 | /** |
| StevenHe | 0:544b5f6ad832 | 260 | * Schedule a protothread. |
| StevenHe | 0:544b5f6ad832 | 261 | * |
| StevenHe | 0:544b5f6ad832 | 262 | * This function shedules a protothread. The return value of the |
| StevenHe | 0:544b5f6ad832 | 263 | * function is non-zero if the protothread is running or zero if the |
| StevenHe | 0:544b5f6ad832 | 264 | * protothread has exited. |
| StevenHe | 0:544b5f6ad832 | 265 | * |
| StevenHe | 0:544b5f6ad832 | 266 | * \param f The call to the C function implementing the protothread to |
| StevenHe | 0:544b5f6ad832 | 267 | * be scheduled |
| StevenHe | 0:544b5f6ad832 | 268 | * |
| StevenHe | 0:544b5f6ad832 | 269 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 270 | */ |
| StevenHe | 0:544b5f6ad832 | 271 | #define PT_SCHEDULE(f) ((f) < PT_EXITED) |
| StevenHe | 0:544b5f6ad832 | 272 | |
| StevenHe | 0:544b5f6ad832 | 273 | /** @} */ |
| StevenHe | 0:544b5f6ad832 | 274 | |
| StevenHe | 0:544b5f6ad832 | 275 | /** |
| StevenHe | 0:544b5f6ad832 | 276 | * \name Yielding from a protothread |
| StevenHe | 0:544b5f6ad832 | 277 | * @{ |
| StevenHe | 0:544b5f6ad832 | 278 | */ |
| StevenHe | 0:544b5f6ad832 | 279 | |
| StevenHe | 0:544b5f6ad832 | 280 | /** |
| StevenHe | 0:544b5f6ad832 | 281 | * Yield from the current protothread. |
| StevenHe | 0:544b5f6ad832 | 282 | * |
| StevenHe | 0:544b5f6ad832 | 283 | * This function will yield the protothread, thereby allowing other |
| StevenHe | 0:544b5f6ad832 | 284 | * processing to take place in the system. |
| StevenHe | 0:544b5f6ad832 | 285 | * |
| StevenHe | 0:544b5f6ad832 | 286 | * \param pt A pointer to the protothread control structure. |
| StevenHe | 0:544b5f6ad832 | 287 | * |
| StevenHe | 0:544b5f6ad832 | 288 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 289 | */ |
| StevenHe | 0:544b5f6ad832 | 290 | #define PT_YIELD(pt) \ |
| StevenHe | 0:544b5f6ad832 | 291 | do { \ |
| StevenHe | 0:544b5f6ad832 | 292 | PT_YIELD_FLAG = 0; \ |
| StevenHe | 0:544b5f6ad832 | 293 | LC_SET((pt)->lc); \ |
| StevenHe | 0:544b5f6ad832 | 294 | if(PT_YIELD_FLAG == 0) { \ |
| StevenHe | 0:544b5f6ad832 | 295 | return PT_YIELDED; \ |
| StevenHe | 0:544b5f6ad832 | 296 | } \ |
| StevenHe | 0:544b5f6ad832 | 297 | } while(0) |
| StevenHe | 0:544b5f6ad832 | 298 | |
| StevenHe | 0:544b5f6ad832 | 299 | /** |
| StevenHe | 0:544b5f6ad832 | 300 | * \brief Yield from the protothread until a condition occurs. |
| StevenHe | 0:544b5f6ad832 | 301 | * \param pt A pointer to the protothread control structure. |
| StevenHe | 0:544b5f6ad832 | 302 | * \param cond The condition. |
| StevenHe | 0:544b5f6ad832 | 303 | * |
| StevenHe | 0:544b5f6ad832 | 304 | * This function will yield the protothread, until the |
| StevenHe | 0:544b5f6ad832 | 305 | * specified condition evaluates to true. |
| StevenHe | 0:544b5f6ad832 | 306 | * |
| StevenHe | 0:544b5f6ad832 | 307 | * |
| StevenHe | 0:544b5f6ad832 | 308 | * \hideinitializer |
| StevenHe | 0:544b5f6ad832 | 309 | */ |
| StevenHe | 0:544b5f6ad832 | 310 | #define PT_YIELD_UNTIL(pt, cond) \ |
| StevenHe | 0:544b5f6ad832 | 311 | do { \ |
| StevenHe | 0:544b5f6ad832 | 312 | PT_YIELD_FLAG = 0; \ |
| StevenHe | 0:544b5f6ad832 | 313 | LC_SET((pt)->lc); \ |
| StevenHe | 0:544b5f6ad832 | 314 | if((PT_YIELD_FLAG == 0) || !(cond)) { \ |
| StevenHe | 0:544b5f6ad832 | 315 | return PT_YIELDED; \ |
| StevenHe | 0:544b5f6ad832 | 316 | } \ |
| StevenHe | 0:544b5f6ad832 | 317 | } while(0) |
| StevenHe | 0:544b5f6ad832 | 318 | |
| StevenHe | 0:544b5f6ad832 | 319 | /** @} */ |
| StevenHe | 0:544b5f6ad832 | 320 | |
| StevenHe | 0:544b5f6ad832 | 321 | #endif /* __PT_H__ */ |
| StevenHe | 0:544b5f6ad832 | 322 | |
| StevenHe | 0:544b5f6ad832 | 323 | /** @} */ |