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POAndroid passing large float arrays from native to java via jni. Getting error if over certain size
 

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  1. POAndroid passing large float arrays from native to java via jni. Getting error if over certain size
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    <p>I am wanting to pass a single large array of floats anywhere up too and beyond float[100000]. I have a setup successfully passing an array of size 212. But any larger and it crashes giving the following error message in the logcat:</p> <p>"Fatal signal 11 (SIGSEGV) at 0xbe949000 (code=1)"</p> <h2>My code</h2> <p><strong>Native function</strong></p> <pre><code>NIEXPORT jfloatArray JNICALL Java_carron_graphics_benchmark_NativeWrapper_getArrayNative(JNIEnv * env, jclass cls) { int tempSize = mParticleSystem-&gt;mSizeOfSystem*2; jfloat cArray[tempSize]; jsize len = sizeof(cArray); jfloatArray jArray = (*env).NewFloatArray(len); if (jArray != NULL) { jint i; for (i = 0; i &lt; tempSize; i++) { cArray[i] = mParticleSystem-&gt;mParticlePositions[i]; } (*env).SetFloatArrayRegion(jArray, 0, len, cArray); } return jArray; } </code></pre> <p><strong>Java</strong> Pretty straight forward simply grabbing the array. If I create and pass a float array larger than 212 though I get the error as shown above.</p> <pre><code>float tempArray[] = NativeWrapper.getArrayNative(); </code></pre> <p><strong>Has anyone encountered this problem or can see how I can get around this limit? Also I apologise if this question has been answered already, I could not find this specific issue nor an answer. Any help will be appreciated :)</strong></p> <p>EDIT:</p> <p>For updating a global jfloatArray to avoid the garbage collector when frequently fetching an array through jni.</p> <pre><code>static jfloatArray gArray = NULL; JNIEXPORT jfloatArray JNICALL Java_carron_graphics_benchmark_NativeWrapper_getArrayNative(JNIEnv * env, jclass cls) { int arrayLength = mParticleSystem-&gt;mSizeOfSystem*2; if (gArray == NULL) { // create array jfloatArray jArray; jArray = env-&gt;NewFloatArray(arrayLength); gArray = (jfloatArray)env-&gt;NewGlobalRef(jArray); } // Update global env-&gt;SetFloatArrayRegion(gArray, 0, arrayLength, mParticleSystem-&gt;mParticlePositions); return gArray; } </code></pre>
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