12-10-2009
Dream Warrior - consider trampolines or indirect function calls found most often in callbacks. I think python uses trampolines to support coroutines. ghostdog would know for sure.
Linux trampoline code is described in great detail in: 'Understanding the Linux Kernel' by Daniel P. Bovet and Marco Cesati.
gcc documentation:
Trampolines - GNU Compiler Collection (GCC) Internals
The lazy man's version -
A trampoline is small code segment, usually a vector, created at run time. It normally lives on the stack, in the stack frame of the 'holding' function.
For mixing pieces of code with incompatible calling conventions, trampolines can convert the caller's convention to the callee's convention. For example, C code that needs to call C++ objects can have a trampoline to change calling conventions.
gcc implements trampolines as nested functions.
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LEARN ABOUT MOJAVE
atexit_b
ATEXIT(3) BSD Library Functions Manual ATEXIT(3)
NAME
atexit -- register a function to be called on exit
SYNOPSIS
#include <stdlib.h>
int
atexit(void (*function)(void));
int
atexit_b(void (^function)(void));
DESCRIPTION
The atexit() function registers the given function to be called at program exit, whether via exit(3) or via return from the program's main().
Functions so registered are called in reverse order; no arguments are passed.
If the provided function is located in a library that has been dynamically loaded (e.g. by dlopen()), it will be called when the library is
unloaded (due to a call to dlclose()) or at program exit.
The atexit_b() function is like atexit() except the callback is a block pointer instead of a function pointer.
Note: The Block_copy() function (defined in <Blocks.h>) is used by atexit_b() to make a copy of the block, especially for the case when
a stack-based block might go out of scope when the subroutine returns.
These functions must not call exit(); if it should be necessary to terminate the process while in such a function, the _exit(2) function
should be used. (Alternatively, the function may cause abnormal process termination, for example by calling abort(3).)
At least 32 functions can always be registered, and more are allowed as long as sufficient memory can be allocated.
RETURN VALUES
The atexit() and atexit_b() functions return the value 0 if successful; otherwise the value -1 is returned and the global variable errno is
set to indicate the error.
ERRORS
[ENOMEM] No memory was available to add the function to the list. The existing list of functions is unmodified.
SEE ALSO
exit(3)
STANDARDS
The atexit() function conforms to ISO/IEC 9899:1990 (``ISO C90'').
BSD
September 6, 2002 BSD