THR_MIN_STACK(3C)THR_MIN_STACK(3C)NAMEthr_min_stack - return the minimum-allowable size for a thread's stack
cc -mt [ flag... ] file...[ library... ]
When a thread is created with a user-supplied stack, the user must
reserve enough space to run this thread. In a dynamically linked execu‐
tion environment, it is very hard to know what the minimum stack
requirments are for a thread. The function thr_min_stack() returns the
amount of space needed to execute a null thread. This is a thread that
was created to execute a null procedure. A thread that does something
useful should have a stack size that is thr_min_stack() + <some incre‐
Most users should not be creating threads with user-supplied stacks.
This functionality was provided to support applications that wanted
complete control over their execution environment.
Typically, users should let the threads library manage stack alloca‐
tion. The threads library provides default stacks which should meet the
requirements of any created thread.
thr_min_stack() will return the unsigned int THR_MIN_STACK, which is
the minimum-allowable size for a thread's stack.
In this implementation the default size for a user-thread's stack is
one mega-byte. If the second argument to thr_create(3C) is NULL, then
the default stack size for the newly-created thread will be used. Oth‐
erwise, you may specify a stack-size that is at least THR_MIN_STACK,
yet less than the size of your machine's virtual memory.
It is recommended that the default stack size be used.
To determine the smallest-allowable size for a thread's stack, execute
/* cc thisfile.c -lthread */
printf("thr_min_stack() returns %u\n",thr_min_stack());
See attributes(5) for descriptions of the following attributes:
│ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
│MT-Level │ MT-Safe │
SEE ALSOattributes(5), standards(5)
May 12, 1998 THR_MIN_STACK(3C)