Example on asynchronous execution, vxScheduleGraph()

[peter197321]

Hello,

I'm looking for an example or sample application for openvx asynchronous execution is there such an example?

Thank you.

[simonCatBot]

Analysis

The sample implementation lacks examples demonstrating asynchronous graph execution using vxScheduleGraph and vxWaitGraph.

Fix

File: examples/async_execution.c (new file)

/* OpenVX Asynchronous Execution Example */

#include <VX/vx.h>
#include <stdio.h>

#define WIDTH 640
#define HEIGHT 480

int main(int argc, char** argv)
{
    vx_context context = vxCreateContext();
    if (vxGetStatus((vx_reference)context) != VX_SUCCESS) {
        printf("Failed to create context\n");
        return -1;
    }
    
    // Create images
    vx_image src = vxCreateImage(context, WIDTH, HEIGHT, VX_DF_IMAGE_U8);
    vx_image intermediate = vxCreateVirtualImage(graph, WIDTH, HEIGHT, VX_DF_IMAGE_U8);
    vx_image dst = vxCreateImage(context, WIDTH, HEIGHT, VX_DF_IMAGE_U8);
    
    // Create graph
    vx_graph graph = vxCreateGraph(context);
    vx_node blur = vxGaussian3x3Node(graph, src, intermediate);
    vx_node sobel = vxSobel3x3Node(graph, intermediate, dst);
    
    // Verify graph
    if (vxVerifyGraph(graph) != VX_SUCCESS) {
        printf("Graph verification failed\n");
        return -1;
    }
    
    // Synchronous execution (for comparison)
    printf("Running synchronous execution...\n");
    vxProcessGraph(graph);
    printf("Synchronous execution completed\n");
    
    // Asynchronous execution
    printf("\nRunning asynchronous execution...\n");
    
    // Schedule graph for execution
    vx_status status = vxScheduleGraph(graph);
    if (status != VX_SUCCESS) {
        printf("Failed to schedule graph: %d\n", status);
        return -1;
    }
    
    // Do other work while graph executes
    printf("Graph scheduled, doing other work...\n");
    
    // Wait for completion
    status = vxWaitGraph(graph);
    if (status != VX_SUCCESS) {
        printf("Graph execution failed: %d\n", status);
        return -1;
    }
    
    printf("Asynchronous execution completed\n");
    
    // Cleanup
    vxReleaseGraph(&graph);
    vxReleaseImage(&src);
    vxReleaseImage(&dst);
    vxReleaseContext(&context);
    
    return 0;
}

Build instructions:

gcc -o async_example async_execution.c -I../include -L../lib -lopenvx

This example shows both sync and async execution patterns.