PCIDSK CPL Mutex adapter creates mutex in acquired state

[Even Rouault]

The following code blocks in GDALChecksumImage() when run on a .pix file.

#include <gdal.h>
#include <gdal_alg.h>
#include "cpl_multiproc.h"

void my_thread(void* pData)
{
    GDALDatasetH hDS;
    int checksum;  
    hDS = (GDALDatasetH)pData;
  
    printf("in thread\n");
    checksum = GDALChecksumImage(GDALGetRasterBand(hDS, 1), 0, 0, 20, 20);
    printf("checksum = %d\n", checksum);
}

int main(int argc, char* argv[])
{
    GDALDatasetH hDS;
    GDALAllRegister();
    hDS = GDALOpen("byte.pix", GA_ReadOnly);
    CPLCreateThread(my_thread, hDS);
    CPLSleep(2);
    printf("finished\n");
    return 0;
}

This is due to an improper locking state at the creation of the CPLThreadMutex implementation of PCIDSK::Mutex

[Even Rouault]

Fixed in trunk (r20630) and in branches/1.7 (r20631)