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|
page.title=RenderScript Atomic Update Functions
@jd:body
<div class='renderscript'>
<h2>Overview</h2>
<p> To update values shared between multiple threads, use the functions below.
They ensure that the values are atomically updated, i.e. that the memory
reads, the updates, and the memory writes are done in the right order.
</p>
<p> These functions are slower than their non-atomic equivalents, so use
them only when synchronization is needed.
</p>
<p> Note that in RenderScript, your code is likely to be running in separate
threads even though you did not explicitely create them. The RenderScript
runtime will very often split the execution of one kernel across multiple
threads. Updating globals should be done with atomic functions. If possible,
modify your algorithm to avoid them altogether.
</p>
<h2>Summary</h2>
<table class='jd-sumtable'><tbody>
<tr><th colspan='2'>Functions</th></tr>
<tr class='alt-color api apilevel-1'>
<td class='jd-linkcol'>
<a href='rs_atomic.html#android_rs:rsAtomicAdd'>rsAtomicAdd</a>
</td>
<td class='jd-descrcol' width='100%'>
Thread-safe addition
</td>
</tr>
<tr class='alt-color api apilevel-1'>
<td class='jd-linkcol'>
<a href='rs_atomic.html#android_rs:rsAtomicAnd'>rsAtomicAnd</a>
</td>
<td class='jd-descrcol' width='100%'>
Thread-safe bitwise and
</td>
</tr>
<tr class='alt-color api apilevel-1'>
<td class='jd-linkcol'>
<a href='rs_atomic.html#android_rs:rsAtomicCas'>rsAtomicCas</a>
</td>
<td class='jd-descrcol' width='100%'>
Thread-safe compare and set
</td>
</tr>
<tr class='alt-color api apilevel-1'>
<td class='jd-linkcol'>
<a href='rs_atomic.html#android_rs:rsAtomicDec'>rsAtomicDec</a>
</td>
<td class='jd-descrcol' width='100%'>
Thread-safe decrement
</td>
</tr>
<tr class='alt-color api apilevel-1'>
<td class='jd-linkcol'>
<a href='rs_atomic.html#android_rs:rsAtomicInc'>rsAtomicInc</a>
</td>
<td class='jd-descrcol' width='100%'>
Thread-safe increment
</td>
</tr>
<tr class='alt-color api apilevel-1'>
<td class='jd-linkcol'>
<a href='rs_atomic.html#android_rs:rsAtomicMax'>rsAtomicMax</a>
</td>
<td class='jd-descrcol' width='100%'>
Thread-safe maximum
</td>
</tr>
<tr class='alt-color api apilevel-1'>
<td class='jd-linkcol'>
<a href='rs_atomic.html#android_rs:rsAtomicMin'>rsAtomicMin</a>
</td>
<td class='jd-descrcol' width='100%'>
Thread-safe minimum
</td>
</tr>
<tr class='alt-color api apilevel-1'>
<td class='jd-linkcol'>
<a href='rs_atomic.html#android_rs:rsAtomicOr'>rsAtomicOr</a>
</td>
<td class='jd-descrcol' width='100%'>
Thread-safe bitwise or
</td>
</tr>
<tr class='alt-color api apilevel-1'>
<td class='jd-linkcol'>
<a href='rs_atomic.html#android_rs:rsAtomicSub'>rsAtomicSub</a>
</td>
<td class='jd-descrcol' width='100%'>
Thread-safe subtraction
</td>
</tr>
<tr class='alt-color api apilevel-1'>
<td class='jd-linkcol'>
<a href='rs_atomic.html#android_rs:rsAtomicXor'>rsAtomicXor</a>
</td>
<td class='jd-descrcol' width='100%'>
Thread-safe bitwise exclusive or
</td>
</tr>
</tbody></table>
<h2>Functions</h2>
<a name='android_rs:rsAtomicAdd'></a>
<div class='jd-details'>
<h4 class='jd-details-title'>
<span class='sympad'>rsAtomicAdd</span>
<span class='normal'>: Thread-safe addition</span>
</h4>
<div class='jd-details-descr'>
<table class='jd-tagtable'><tbody>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicAdd(volatile <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a>* addr, <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicAdd(volatile <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a>* addr, <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 20</a>
</td>
</tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Parameters</h5>
<table class='jd-tagtable'><tbody>
<tr><th>addr</th><td>Address of the value to modify.</td></tr>
<tr><th>value</th><td>Amount to add.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Returns</h5>
<table class='jd-tagtable'><tbody>
<tr><td>Value of *addr prior to the operation.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata jd-tagdescr'>
<p> Atomicly adds a value to the value at addr, i.e. <code>*addr += value</code>.
</p>
</div>
</div>
<a name='android_rs:rsAtomicAnd'></a>
<div class='jd-details'>
<h4 class='jd-details-title'>
<span class='sympad'>rsAtomicAnd</span>
<span class='normal'>: Thread-safe bitwise and</span>
</h4>
<div class='jd-details-descr'>
<table class='jd-tagtable'><tbody>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicAnd(volatile <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a>* addr, <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicAnd(volatile <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a>* addr, <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 20</a>
</td>
</tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Parameters</h5>
<table class='jd-tagtable'><tbody>
<tr><th>addr</th><td>Address of the value to modify.</td></tr>
<tr><th>value</th><td>Value to and with.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Returns</h5>
<table class='jd-tagtable'><tbody>
<tr><td>Value of *addr prior to the operation.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata jd-tagdescr'>
<p> Atomicly performs a bitwise and of two values, storing the result back at addr,
i.e. <code>*addr &= value</code>.
</p>
</div>
</div>
<a name='android_rs:rsAtomicCas'></a>
<div class='jd-details'>
<h4 class='jd-details-title'>
<span class='sympad'>rsAtomicCas</span>
<span class='normal'>: Thread-safe compare and set</span>
</h4>
<div class='jd-details-descr'>
<table class='jd-tagtable'><tbody>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicCas(volatile <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a>* addr, <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> compareValue, <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> newValue);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
<tr>
<td><a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> rsAtomicCas(volatile <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a>* addr, <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> compareValue, <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> newValue);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Parameters</h5>
<table class='jd-tagtable'><tbody>
<tr><th>addr</th><td>Address of the value to compare and replace if the test passes.</td></tr>
<tr><th>compareValue</th><td>Value to test *addr against.</td></tr>
<tr><th>newValue</th><td>Value to write if the test passes.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Returns</h5>
<table class='jd-tagtable'><tbody>
<tr><td>Value of *addr prior to the operation.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata jd-tagdescr'>
<p> If the value at addr matches compareValue then the newValue is written at addr,
i.e. <code>if (*addr == compareValue) { *addr = newValue; }</code>.
</p>
<p> You can check that the value was written by checking that the value returned
by rsAtomicCas() is compareValue.
</p>
</div>
</div>
<a name='android_rs:rsAtomicDec'></a>
<div class='jd-details'>
<h4 class='jd-details-title'>
<span class='sympad'>rsAtomicDec</span>
<span class='normal'>: Thread-safe decrement</span>
</h4>
<div class='jd-details-descr'>
<table class='jd-tagtable'><tbody>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicDec(volatile <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a>* addr);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicDec(volatile <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a>* addr);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 20</a>
</td>
</tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Parameters</h5>
<table class='jd-tagtable'><tbody>
<tr><th>addr</th><td>Address of the value to decrement.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Returns</h5>
<table class='jd-tagtable'><tbody>
<tr><td>Value of *addr prior to the operation.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata jd-tagdescr'>
<p> Atomicly subtracts one from the value at addr. This is equivalent to <code><a href='rs_atomic.html#android_rs:rsAtomicSub'>rsAtomicSub</a>(addr, 1)</code>.
</p>
</div>
</div>
<a name='android_rs:rsAtomicInc'></a>
<div class='jd-details'>
<h4 class='jd-details-title'>
<span class='sympad'>rsAtomicInc</span>
<span class='normal'>: Thread-safe increment</span>
</h4>
<div class='jd-details-descr'>
<table class='jd-tagtable'><tbody>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicInc(volatile <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a>* addr);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicInc(volatile <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a>* addr);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 20</a>
</td>
</tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Parameters</h5>
<table class='jd-tagtable'><tbody>
<tr><th>addr</th><td>Address of the value to increment.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Returns</h5>
<table class='jd-tagtable'><tbody>
<tr><td>Value of *addr prior to the operation.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata jd-tagdescr'>
<p> Atomicly adds one to the value at addr. This is equivalent to <code><a href='rs_atomic.html#android_rs:rsAtomicAdd'>rsAtomicAdd</a>(addr, 1)</code>.
</p>
</div>
</div>
<a name='android_rs:rsAtomicMax'></a>
<div class='jd-details'>
<h4 class='jd-details-title'>
<span class='sympad'>rsAtomicMax</span>
<span class='normal'>: Thread-safe maximum</span>
</h4>
<div class='jd-details-descr'>
<table class='jd-tagtable'><tbody>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicMax(volatile <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a>* addr, <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
<tr>
<td><a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> rsAtomicMax(volatile <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a>* addr, <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Parameters</h5>
<table class='jd-tagtable'><tbody>
<tr><th>addr</th><td>Address of the value to modify.</td></tr>
<tr><th>value</th><td>Comparison value.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Returns</h5>
<table class='jd-tagtable'><tbody>
<tr><td>Value of *addr prior to the operation.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata jd-tagdescr'>
<p> Atomicly sets the value at addr to the maximum of *addr and value, i.e.
<code>*addr = max(*addr, value)</code>.
</p>
</div>
</div>
<a name='android_rs:rsAtomicMin'></a>
<div class='jd-details'>
<h4 class='jd-details-title'>
<span class='sympad'>rsAtomicMin</span>
<span class='normal'>: Thread-safe minimum</span>
</h4>
<div class='jd-details-descr'>
<table class='jd-tagtable'><tbody>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicMin(volatile <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a>* addr, <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
<tr>
<td><a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> rsAtomicMin(volatile <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a>* addr, <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Parameters</h5>
<table class='jd-tagtable'><tbody>
<tr><th>addr</th><td>Address of the value to modify.</td></tr>
<tr><th>value</th><td>Comparison value.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Returns</h5>
<table class='jd-tagtable'><tbody>
<tr><td>Value of *addr prior to the operation.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata jd-tagdescr'>
<p> Atomicly sets the value at addr to the minimum of *addr and value, i.e.
<code>*addr = min(*addr, value)</code>.
</p>
</div>
</div>
<a name='android_rs:rsAtomicOr'></a>
<div class='jd-details'>
<h4 class='jd-details-title'>
<span class='sympad'>rsAtomicOr</span>
<span class='normal'>: Thread-safe bitwise or</span>
</h4>
<div class='jd-details-descr'>
<table class='jd-tagtable'><tbody>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicOr(volatile <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a>* addr, <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicOr(volatile <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a>* addr, <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 20</a>
</td>
</tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Parameters</h5>
<table class='jd-tagtable'><tbody>
<tr><th>addr</th><td>Address of the value to modify.</td></tr>
<tr><th>value</th><td>Value to or with.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Returns</h5>
<table class='jd-tagtable'><tbody>
<tr><td>Value of *addr prior to the operation.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata jd-tagdescr'>
<p> Atomicly perform a bitwise or two values, storing the result at addr,
i.e. <code>*addr |= value</code>.
</p>
</div>
</div>
<a name='android_rs:rsAtomicSub'></a>
<div class='jd-details'>
<h4 class='jd-details-title'>
<span class='sympad'>rsAtomicSub</span>
<span class='normal'>: Thread-safe subtraction</span>
</h4>
<div class='jd-details-descr'>
<table class='jd-tagtable'><tbody>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicSub(volatile <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a>* addr, <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicSub(volatile <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a>* addr, <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 20</a>
</td>
</tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Parameters</h5>
<table class='jd-tagtable'><tbody>
<tr><th>addr</th><td>Address of the value to modify.</td></tr>
<tr><th>value</th><td>Amount to subtract.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Returns</h5>
<table class='jd-tagtable'><tbody>
<tr><td>Value of *addr prior to the operation.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata jd-tagdescr'>
<p> Atomicly subtracts a value from the value at addr, i.e. <code>*addr -= value</code>.
</p>
</div>
</div>
<a name='android_rs:rsAtomicXor'></a>
<div class='jd-details'>
<h4 class='jd-details-title'>
<span class='sympad'>rsAtomicXor</span>
<span class='normal'>: Thread-safe bitwise exclusive or</span>
</h4>
<div class='jd-details-descr'>
<table class='jd-tagtable'><tbody>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicXor(volatile <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a>* addr, <a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 14</a>
</td>
</tr>
<tr>
<td><a href='rs_value_types.html#android_rs:int32_t'>int32_t</a> rsAtomicXor(volatile <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a>* addr, <a href='rs_value_types.html#android_rs:uint32_t'>uint32_t</a> value);
</td>
<td> Added in <a href='http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels'>API level 20</a>
</td>
</tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Parameters</h5>
<table class='jd-tagtable'><tbody>
<tr><th>addr</th><td>Address of the value to modify.</td></tr>
<tr><th>value</th><td>Value to xor with.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata'> <h5 class='jd-tagtitle'>Returns</h5>
<table class='jd-tagtable'><tbody>
<tr><td>Value of *addr prior to the operation.</td></tr>
</tbody></table>
</div>
<div class='jd-tagdata jd-tagdescr'>
<p> Atomicly performs a bitwise xor of two values, storing the result at addr,
i.e. <code>*addr ^= value</code>.
</p>
</div>
</div>
</div>
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