c++ - Parallel STXXL Vector Initialization -

the following minimal example illustrates behaviour of stxxl when initializing containers in parallel (using openmp):

#include <omp.h> #include <stdio.h> #include <stxxl.h>  typedef stxxl::vector_generator<float>::result vec_t;  int main(int argc, char* argv[]) {     const unsigned long num = 8;     #pragma omp parallel num_threads(num)      {                    vec_t v;             printf("%d\t%p\n", omp_get_thread_num(), &v);     }     return exit_success; } 

running either

[stxxl-error] file large  

or

[system-error]segmentation fault 

how can allocate stxxl containers in multiple threads ?

the initialization of stxxl containers isn't thread-safe, therefore mutual exclusion thread initializing container needed. using openmp, read follows:

#include <omp.h> #include <stdio.h> #include <stxxl.h>  typedef stxxl::vector_generator<float>::result vec_t;  int main(int argc, char* argv[]) {     const unsigned long num = 8;     #pragma omp parallel num_threads(num)      {             vec_t* v;             #pragma omp critical             {                     v = new vec_t();             }             printf("%d\t%p\n", omp_get_thread_num(), &v);             delete v;     }     return exit_success; }