mirror of https://github.com/bsnes-emu/bsnes.git
108 lines
4.4 KiB
HTML
108 lines
4.4 KiB
HTML
<html>
|
|
<head>
|
|
<title></title>
|
|
<link href="style.css" rel="stylesheet" type="text/css">
|
|
</head>
|
|
<body>
|
|
|
|
<b>License:</b><br/><br/>
|
|
libco is released to the public domain.
|
|
<hr/>
|
|
|
|
<b>Contact:</b><br/><br/>
|
|
At present, you may contact me at setsunakun0 at hotmail dot com.<br/>
|
|
I am interested in knowing of any projects that make use of this library,
|
|
though this is only a courtesy.
|
|
<hr/>
|
|
|
|
<b>Foreword:</b><br/><br/>
|
|
libco is a cross-platform, public domain implementation of
|
|
cooperative-multithreading; a feature that is sorely lacking
|
|
from the ISO C/C++ standard.<br/>
|
|
The library is designed for maximum speed and portability, and
|
|
not for safety or features. If safety or extra functionality is desired,
|
|
a wrapper API can easily be written to encapsulate all library functions.<br/>
|
|
Behavior of executing operations that are listed as not permitted
|
|
below result in undefined behavior. They may work anyway, they
|
|
may cause undesired / unknown behavior, or they may crash the
|
|
program entirely.<br/>
|
|
The goal of this library was to simplify the base API as much as possible,
|
|
implementing only that which cannot be implemented using pure C. Additional
|
|
functionality after this would only complicate ports of this library to new
|
|
platforms.
|
|
<hr/>
|
|
|
|
<b>Porting:</b><br/><br/>
|
|
This document is included as a reference for porting libco. Please submit any
|
|
ports you create to me, so that libco can become more useful. Please note that
|
|
since libco is public domain, you must submit your code as a work of the
|
|
public domain in order for it to be included in the official distribution.
|
|
Full credit will be given in the source code of the official release. Please
|
|
do not bother submitting code to me under any other license -- including GPL,
|
|
LGPL, BSD or CC -- I am not interested in creating a library with multiple
|
|
different licenses depending on which targets are used.
|
|
<hr/>
|
|
|
|
<b>Synopsis:</b><br/><br/>
|
|
<code>
|
|
typedef void* cothread_t;<br/>
|
|
<br/>
|
|
cothread_t co_active();<br/>
|
|
cothread_t co_create(unsigned int heapsize, void (*coentry)(void));<br/>
|
|
void co_delete(cothread_t cothread);<br/>
|
|
void co_switch(cothread_t cothread);<br/>
|
|
</code>
|
|
<hr/>
|
|
|
|
<b>Usage:</b>
|
|
<hr/>
|
|
|
|
<code>typedef void* cothread_t;</code><br/><br/>
|
|
Handle to cothread.<br/>
|
|
Handle must be of type void*.<br/>
|
|
A value of null (0) indicates an uninitialized or invalid
|
|
handle, whereas a non-zero value indicates a valid handle.
|
|
<hr/>
|
|
|
|
<code>cothread_t co_active();</code><br/><br/>
|
|
Return handle to current cothread. Always returns a valid handle, even when
|
|
called from the main program thread.
|
|
<hr/>
|
|
|
|
<code>cothread_t co_create(unsigned int heapsize, void (*coentry)(void));</code><br/><br/>
|
|
Create new cothread.<br/>
|
|
Heapsize is the amount of memory allocated for the cothread stack, specified
|
|
in bytes. This is unfortunately impossible to make fully portable. It is
|
|
recommended to specify sizes using `n * sizeof(void*)'. It is better to err
|
|
on the side of caution and allocate more memory than will be needed to ensure
|
|
compatibility with other platforms, within reason. A typical heapsize for a
|
|
32-bit architecture is ~1MB.<br/>
|
|
When the new cothread is first called, program execution jumps to coentry.
|
|
This function does not take any arguments, due to portability issues with
|
|
passing function arguments. However, arguments can be simulated by the use
|
|
of global variables, which can be set before the first call to each cothread.<br/>
|
|
coentry() must not return, and should end with an appropriate co_switch()
|
|
statement. Behavior is undefined if entry point returns normally.<br/>
|
|
Library is responsible for allocating cothread stack memory, to free
|
|
the user from needing to allocate special memory capable of being used
|
|
as program stack memory on platforms where this is required.<br/>
|
|
User is always responsible for deleting cothreads with co_delete().<br/>
|
|
Return value of null (0) indicates cothread creation failed.
|
|
<hr/>
|
|
|
|
<code>void co_delete(cothread_t cothread);</code><br/><br/>
|
|
Delete specified cothread.<br/>
|
|
Null (0) or invalid cothread handle is not allowed.<br/>
|
|
Passing handle of active cothread to this function is not allowed.<br/>
|
|
Passing handle of primary cothread is not allowed.
|
|
<hr/>
|
|
|
|
<code>void co_switch(cothread_t cothread);</code><br/><br/>
|
|
Switch to specified cothread.<br/>
|
|
Null (0) or invalid cothread handle is not allowed.<br/>
|
|
Passing handle of active cothread to this function is not allowed.
|
|
<hr/>
|
|
|
|
</body>
|
|
</html>
|