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<title>NVIDIA CUDA Library: cudaDeviceCanAccessPeer</title>
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<div class="navpath"><a class="el" href="group__CUDART__PEER.html">Peer Device Memory Access</a>
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<tr><td class="navtab"><a class="qindexHL" href="group__CUDART__PEER_gbc095a10a4d953e972ef918997c5e567.html#gbc095a10a4d953e972ef918997c5e567">cudaDeviceCanAccessPeer</a></td></tr>
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<a class="anchor" name="gbc095a10a4d953e972ef918997c5e567"></a><!-- doxytag: member="cuda_runtime_api.h::cudaDeviceCanAccessPeer" ref="gbc095a10a4d953e972ef918997c5e567" args="(int *canAccessPeer, int device, int peerDevice)" -->
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<td class="memname"><a class="el" href="group__CUDART__TYPES_gf599e5b8b829ce7db0f5216928f6ecb6.html#gf599e5b8b829ce7db0f5216928f6ecb6">cudaError_t</a> cudaDeviceCanAccessPeer </td>
<td>(</td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>canAccessPeer</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>device</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>peerDevice</em></td><td> </td>
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<p>
Returns in <code>*canAccessPeer</code> a value of 1 if device <code>device</code> is capable of directly accessing memory from <code>peerDevice</code> and 0 otherwise. If direct access of <code>peerDevice</code> from <code>device</code> is possible, then access may be enabled by calling <a class="el" href="group__CUDART__PEER_g9e5ea65a18938c2b8715a5602105c306.html#g9e5ea65a18938c2b8715a5602105c306" title="Enables direct access to memory allocations on a peer device.">cudaDeviceEnablePeerAccess()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>canAccessPeer</em> </td><td>- Returned access capability </td></tr>
<tr><td valign="top"></td><td valign="top"><em>device</em> </td><td>- Device from which allocations on <code>peerDevice</code> are to be directly accessed. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>peerDevice</em> </td><td>- Device on which the allocations to be directly accessed by <code>device</code> reside.</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd><a class="el" href="group__CUDART__TYPES_g3f51e3575c2178246db0a94a430e0038.html#gg3f51e3575c2178246db0a94a430e0038e355f04607d824883b4a50662830d591">cudaSuccess</a>, <a class="el" href="group__CUDART__TYPES_g3f51e3575c2178246db0a94a430e0038.html#gg3f51e3575c2178246db0a94a430e0038938c6e8b96ecde62e3ab5137156f739a">cudaErrorInvalidDevice</a> </dd></dl>
<dl class="note" compact><dt><b>Note:</b></dt><dd>Note that this function may also return error codes from previous, asynchronous launches.</dd></dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="group__CUDART__PEER_g9e5ea65a18938c2b8715a5602105c306.html#g9e5ea65a18938c2b8715a5602105c306" title="Enables direct access to memory allocations on a peer device.">cudaDeviceEnablePeerAccess</a>, <a class="el" href="group__CUDART__PEER_gae24fc50bd0f1ce7f69032f91bde87ac.html#gae24fc50bd0f1ce7f69032f91bde87ac" title="Disables direct access to memory allocations on a peer device and unregisters any...">cudaDeviceDisablePeerAccess</a> </dd></dl>
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