3 replies to this topic

[mynickmynick]

In linux using pthreads
When I call a whatever usual function (like div() sin() exp() pow() rand() nanosleep() etc.) in the following way:

thread 1
a=div(b,c).rem

thread 2
x=div(y,z).rem

so I call the same function on different (not shared) data
Can I be sure that the two function calls by the two threads do not share any (internal) data (may be registers or global-library-shared) and so have no side unpredicted effect??

[G_Morgan]

Threads have a different register and stack context by definition. As long as you aren't sharing any memory it should be fine.

[mynickmynick]

ok thanks but can I be sure that these "standard-or-usual external libraries functions" when called by different threads do not share global variables (non stack variables) on their own ??

[G_Morgan]

Not without viewing the source code but It's unlikely.