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<h1 class="firstHeading">Interrupting ACIS Operations</h1>
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<p>Installing an interrupt checker with the set_acis_interrupt_checker function allows the application to gracefully interrupt the current ACIS operations and regain control of the process. This is a useful feature when applications want to be responsive to end-user input, such as responding to Ctrl+C input during lengthy operations. This function allows user to install a callback function that is frequently called from various places within ACIS code so that application side events can be evaluated. The callback function receives an informative string, which describes the current function in ACIS. Based on the user request, the callback function can do one of the following:</p><ul><li> call the <tt>interrupt_acis function</tt>, which will interrupt the process in a synchronous manner (preferred)</li><li> call the sys_error function with the <tt>SIGINT_FAULT</tt> argument, which will interrupt the operation asynchronously (immediately)</li><li> application can simply return from the callback, which allows the operation to continue</li></ul><p>This section contains snippets of C++ code to illustrate how to interrupt ACIS operations by defining and installing a callback function. These snippets are designed to be very simple starting points for developing your own code - they are not complete, compiling and runtime programs.</p><a name="Sample_Code"></a><h2> <span class="mw-headline"> Sample Code </span></h2><pre class="source-cpp"><span class="co1">// define the callback function</span><span class="kw4">void</span> acis_interrupt_checker<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span>* func_name <span class="br0">)</span><span class="br0">{</span> <span class="kw1">if</span><span class="br0">(</span> end_user_requests_interrupt<span class="br0">(</span><span class="br0">)</span> <span class="br0">)</span> <span class="br0">{</span> <span class="kw3">printf</span><span class="br0">(</span><span class="st0">"Synchronous user interrupt requested during %s<span class="es0">\n</span>"</span>, func_name<span class="br0">)</span>; <span class="co1">// interrupt the current operation at the next good location</span> interrupt_acis<span class="br0">(</span><span class="br0">)</span>; <span class="br0">}</span><span class="kw1">else</span> <span class="kw1">if</span><span class="br0">(</span> end_user_requests_immediate_interrupt<span class="br0">(</span><span class="br0">)</span> <span class="br0">)</span><span class="br0">{</span> <span class="kw3">printf</span><span class="br0">(</span><span class="st0">"Asynchronous user interrupt requested during %s<span class="es0">\n</span>"</span>, func_name<span class="br0">)</span>;⌨️ 快捷键说明
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