| 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> |
