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| <div class="section" id="semaphore"> |
| <h1>Semaphore<a class="headerlink" href="#semaphore" title="Permalink to this headline">¶</a></h1> |
| <p>A semaphore is a structure used for gaining exclusive access (much like |
| a mutex), synchronizing task operations and/or use in a |
| “producer/consumer” roles. Semaphores like the ones used by the myNewt |
| OS are called “counting” semaphores as they are allowed to have more |
| than one token (explained below).</p> |
| <div class="section" id="description"> |
| <h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2> |
| <p>A semaphore is a fairly simple construct consisting of a queue for |
| waiting tasks and the number of tokens currently owned by the semaphore. |
| A semaphore can be obtained as long as there are tokens in the |
| semaphore. Any task can add tokens to the semaphore and any task can |
| request the semaphore, thereby removing tokens. When creating the |
| semaphore, the initial number of tokens can be set as well.</p> |
| <p>When used for exclusive access to a shared resource the semaphore only |
| needs a single token. In this case, a single task “creates” the |
| semaphore by calling <a class="reference internal" href="#c.os_sem_init" title="os_sem_init"><code class="xref c c-func docutils literal notranslate"><span class="pre">os_sem_init()</span></code></a> with a value of one (1) for the |
| token. When a task desires exclusive access to the shared resource it |
| requests the semaphore by calling <a class="reference internal" href="#c.os_sem_pend" title="os_sem_pend"><code class="xref c c-func docutils literal notranslate"><span class="pre">os_sem_pend()</span></code></a>. If there is a token |
| the requesting task will acquire the semaphore and continue operation. |
| If no tokens are available the task will be put to sleep until there is |
| a token. A common “problem” with using a semaphore for exclusive access |
| is called <em>priority inversion</em>. Consider the following scenario: a high |
| and low priority task both share a resource which is locked using a |
| semaphore. If the low priority task obtains the semaphore and then the |
| high priority task requests the semaphore, the high priority task is now |
| blocked until the low priority task releases the semaphore. Now suppose |
| that there are tasks between the low priority task and the high priority |
| task that want to run. These tasks will preempt the low priority task |
| which owns the semaphore. Thus, the high priority task is blocked |
| waiting for the low priority task to finish using the semaphore but the |
| low priority task cannot run since other tasks are running. Thus, the |
| high priority tasks is “inverted” in priority; in effect running at a |
| much lower priority as normally it would preempt the other (lower |
| priority) tasks. If this is an issue a mutex should be used instead of a |
| semaphore.</p> |
| <p>Semaphores can also be used for task synchronization. A simple example |
| of this would be the following. A task creates a semaphore and |
| initializes it with no tokens. The task then waits on the semaphore, and |
| since there are no tokens, the task is put to sleep. When other tasks |
| want to wake up the sleeping task they simply add a token by calling |
| <a class="reference internal" href="#c.os_sem_release" title="os_sem_release"><code class="xref c c-func docutils literal notranslate"><span class="pre">os_sem_release()</span></code></a>. This will cause the sleeping task to wake up |
| (instantly if no other higher priority tasks want to run).</p> |
| <p>The other common use of a counting semaphore is in what is commonly |
| called a “producer/consumer” relationship. The producer adds tokens (by |
| calling <a class="reference internal" href="#c.os_sem_release" title="os_sem_release"><code class="xref c c-func docutils literal notranslate"><span class="pre">os_sem_release()</span></code></a>) and the consumer consumes them by calling |
| <a class="reference internal" href="#c.os_sem_pend" title="os_sem_pend"><code class="xref c c-func docutils literal notranslate"><span class="pre">os_sem_pend()</span></code></a>. In this relationship, the producer has work for the |
| consumer to do. Each token added to the semaphore will cause the |
| consumer to do whatever work is required. A simple example could be the |
| following: every time a button is pressed there is some work to do (ring |
| a bell). Each button press causes the producer to add a token. Each |
| token consumed rings the bell. There will exactly the same number of |
| bell rings as there are button presses. In other words, each call to |
| <a class="reference internal" href="#c.os_sem_pend" title="os_sem_pend"><code class="xref c c-func docutils literal notranslate"><span class="pre">os_sem_pend()</span></code></a> subtracts exactly one token and each call to |
| <a class="reference internal" href="#c.os_sem_release" title="os_sem_release"><code class="xref c c-func docutils literal notranslate"><span class="pre">os_sem_release()</span></code></a> adds exactly one token.</p> |
| </div> |
| <div class="section" id="api"> |
| <h2>API<a class="headerlink" href="#api" title="Permalink to this headline">¶</a></h2> |
| <dl class="c function"> |
| <dt id="c.os_sem_init"> |
| <span class="target" id="group___o_s_sem_1ga8f44f453e0bb9447272d67bce13c9f34"></span><span class="pre">os_error_t</span> <code class="sig-name descname"><span class="pre">os_sem_init</span></code><span class="sig-paren">(</span><em class="property"><span class="pre">struct</span></em> <a class="reference internal" href="#c.os_sem" title="os_sem"><span class="pre">os_sem</span></a> <span class="pre">*</span><em><span class="pre">sem</span></em>, <span class="pre">uint16_t</span> <em><span class="pre">tokens</span></em><span class="sig-paren">)</span><a class="headerlink" href="#c.os_sem_init" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Initialize a semaphore. </p> |
| <p><dl class="simple"> |
| <dt><strong>Return</strong></dt><dd><p>os_error_t OS_INVALID_PARM Semaphore passed in was NULL. OS_OK no error. </p> |
| </dd> |
| <dt><strong>Parameters</strong></dt><dd><ul class="breatheparameterlist simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">sem</span></code>: Pointer to semaphore tokens: # of tokens the semaphore should contain initially.</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </p> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt id="c.os_sem_release"> |
| <span class="target" id="group___o_s_sem_1ga909a7fa9280e8871cba64e3dce5d6768"></span><span class="pre">os_error_t</span> <code class="sig-name descname"><span class="pre">os_sem_release</span></code><span class="sig-paren">(</span><em class="property"><span class="pre">struct</span></em> <a class="reference internal" href="#c.os_sem" title="os_sem"><span class="pre">os_sem</span></a> <span class="pre">*</span><em><span class="pre">sem</span></em><span class="sig-paren">)</span><a class="headerlink" href="#c.os_sem_release" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Release a semaphore. </p> |
| <p><dl class="simple"> |
| <dt><strong>Return</strong></dt><dd><p>os_error_t OS_INVALID_PARM Semaphore passed in was NULL. OS_OK No error </p> |
| </dd> |
| <dt><strong>Parameters</strong></dt><dd><ul class="breatheparameterlist simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">sem</span></code>: Pointer to the semaphore to be released</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </p> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt id="c.os_sem_pend"> |
| <span class="target" id="group___o_s_sem_1gab224058f433cc1a54c92dfe0bde092d9"></span><span class="pre">os_error_t</span> <code class="sig-name descname"><span class="pre">os_sem_pend</span></code><span class="sig-paren">(</span><em class="property"><span class="pre">struct</span></em> <a class="reference internal" href="#c.os_sem" title="os_sem"><span class="pre">os_sem</span></a> <span class="pre">*</span><em><span class="pre">sem</span></em>, <a class="reference internal" href="../time/os_time.html#c.os_time_t" title="os_time_t"><span class="pre">os_time_t</span></a> <em><span class="pre">timeout</span></em><span class="sig-paren">)</span><a class="headerlink" href="#c.os_sem_pend" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>os sem pend </p> |
| <p>Pend (wait) for a semaphore.</p> |
| <p><dl class="simple"> |
| <dt><strong>Return</strong></dt><dd><p>os_error_t OS_INVALID_PARM Semaphore passed in was NULL. OS_TIMEOUT Semaphore was owned by another task and timeout=0 OS_OK no error. </p> |
| </dd> |
| <dt><strong>Parameters</strong></dt><dd><ul class="breatheparameterlist simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">mu</span></code>: Pointer to semaphore. </p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">timeout</span></code>: Timeout, in os ticks. A timeout of 0 means do not wait if not available. A timeout of OS_TIMEOUT_NEVER means wait forever.</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </p> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt id="c.os_sem_get_count"> |
| <span class="target" id="group___o_s_sem_1gac83a58d5a5a64e0c1bfbadc2a0611539"></span><em class="property"><span class="pre">static</span></em> <em class="property"><span class="pre">inline</span></em> <span class="pre">uint16_t</span> <code class="sig-name descname"><span class="pre">os_sem_get_count</span></code><span class="sig-paren">(</span><em class="property"><span class="pre">struct</span></em> <a class="reference internal" href="#c.os_sem" title="os_sem"><span class="pre">os_sem</span></a> <span class="pre">*</span><em><span class="pre">sem</span></em><span class="sig-paren">)</span><a class="headerlink" href="#c.os_sem_get_count" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Get current semaphore’s count. </p> |
| </dd></dl> |
| |
| <dl class="c struct"> |
| <dt id="c.os_sem"> |
| <span class="target" id="structos__sem"></span><em class="property"><span class="pre">struct</span> </em><code class="sig-name descname"><span class="pre">os_sem</span></code><a class="headerlink" href="#c.os_sem" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><em>#include <os_sem.h></em><p>Structure representing an OS semaphore. </p> |
| <div class="breathe-sectiondef docutils container"> |
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| <dt id="c.os_sem.sem_tokens"> |
| <span class="target" id="structos__sem_1a2bd4c88720d5a9581fe7959c2a5db686"></span><span class="pre">uint16_t</span> <code class="sig-name descname"><span class="pre">sem_tokens</span></code><a class="headerlink" href="#c.os_sem.sem_tokens" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Number of tokens. </p> |
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