static int opj_j2k_get_default_thread_count()
{
- const char* num_threads = getenv("OPJ_NUM_THREADS");
- if (num_threads == NULL || !opj_has_thread_support()) {
+ const char* num_threads_str = getenv("OPJ_NUM_THREADS");
+ int num_cpus;
+ int num_threads;
+
+ if (num_threads_str == NULL || !opj_has_thread_support()) {
return 0;
}
- if (strcmp(num_threads, "ALL_CPUS") == 0) {
- return opj_get_num_cpus();
+ num_cpus = opj_get_num_cpus();
+ if (strcmp(num_threads_str, "ALL_CPUS") == 0) {
+ return num_cpus;
+ }
+ if (num_cpus == 0) {
+ num_cpus = 32;
+ }
+ num_threads = atoi(num_threads_str);
+ if (num_threads < 0) {
+ num_threads = 0;
+ } else if (num_threads > 2 * num_cpus) {
+ num_threads = 2 * num_cpus;
}
- return atoi(num_threads);
+ return num_threads;
}
/* ----------------------------------------------------------------------- */