search for: omp_set_lock

...cture in some compilers. * What are non-seq_cst atomic read, write, update and capture lowered to for each of your targets? * What are seq_cst atomic read, write, update and capture lowered to for each of your targets? * What is the taskwait construct lowered to for each of your targets? * What are omp_set_lock and omp_unset_lock lowered to for each of your targets? * What is a barrier lowered to for each of your targets? * Are any optimisations allowed to reorder, change or remove code that uses any of the synchronisation constructs above, or any of the other synchronisation constructs in section 2.12 of...

...SEXP ans, alocal; omp_lock_t lck; PROTECT(ans = allocVector(VECSXP, n)); ans = allocVector(VECSXP, n); omp_init_lock(&lck); #pragma omp parallel for default(none) private(i, alocal) shared(list, lck,rho, ans, n, expr) for(i = 0; i < n; i++) { omp_set_lock(&lck); PROTECT(alocal = allocVector(VECSXP, 1)); alocal = allocVector(VECSXP, 1); defineVar(install("x"), VECTOR_ELT(list, i), rho); omp_unset_lock(&lck); /* do computational kernel in parallel */ alocal = eval(...

Hi there I'm loking for a time-measurement to measure time-differences in milliseconds. On my search, I only found the following: - package "base": Sys.time() -> only second-accuracy - package "R.utils": System$currentTimeMillis() -> returns integer of milliseconds, but accuracy is only whole seconds too. At the moment I run every bit of code to measure

...; void show_pad(void) { int i; for (i = 0; i<20; i++) printf(" %02x",s.pad[i]); printf("\n"); } int main(void) { int i; printf("size: %d\n",(int)sizeof s); for (i = 0; i<20; i++) s.pad[i] = 7; show_pad(); omp_init_lock (&s.lock); show_pad(); omp_set_lock (&s.lock); show_pad(); return 0; } When compiled using the Rtools compiler with "gcc -m32 -fopenmp", it works fine, printing three lines of output with all numbers being 7. But when compiled with "gcc -m64 -fopenmp", the last two lines have four zeros at the beginning....