I am implementing a multi-threaded API manually on a hardware simulator. We don't have pthread support, so all we do to create a thread is just creating a new stack and assign the PC. However, we have problems with glibc functions such as malloc. How to invoke glibc to be in thread-safe mode?
As an example:
int* x = new int;
delete  x;
for(int n=0; n<4; n++)
I am expecting that the "x"s in each thread is assigned to a different address in the heap. But I found that the 4 threads allocate exactly thesame address to the 4 "x"s, thus, when they try to deallocate "x", it is freed four times and the application invokes an error:
*** glibc detected *** double free or corruption (fasttop):0x00000001201d8a40 ***