Difference between revisions of "IOP OS"
Jump to navigation
Jump to search
Hallowizer (talk | contribs) (Removed redirect to IOS) Tag: Removed redirect |
Hallowizer (talk | contribs) (added interrupts and threads) |
||
| Line 1: | Line 1: | ||
'''IOP OS''' is a set of functions in [[IOS]]'s networking code that convert [[Revolution OS]] calls to IOS [[IOS/Syscalls|syscalls]]; for example, OSAlloc is implemented as a call to IOS_Alloc. | '''IOP OS''' is a set of functions in [[IOS]]'s networking code that convert [[Revolution OS]] calls to IOS [[IOS/Syscalls|syscalls]]; for example, OSAlloc is implemented as a call to IOS_Alloc. | ||
| + | |||
| + | == Toggling interrupts == | ||
| + | Disabling interrupts is simulated by locking a mutex implemented as a message queue and changing the current thread priority to 0x38. While this does not completely prevent concurrent execution within the module,{{check}} it is enough for most uses of <code>OSDisableInterrupts</code>. | ||
| + | |||
| + | == Threads == | ||
| + | Threads are implemented as a proxy to [[IOS/Kernel#Threads|IOS threads]]. Because of this, <code>OSThreadQueue</code> is only used for suspended queues. | ||
| + | |||
| + | <pre> | ||
| + | struct OSThread { | ||
| + | int threadId; | ||
| + | int priority; | ||
| + | void *threadSpecific; | ||
| + | struct OSThread *next; | ||
| + | } | ||
| + | |||
| + | struct OSThreadQueue { | ||
| + | struct OSThread *head; | ||
| + | struct OSThread *tail; | ||
| + | } | ||
| + | </pre> | ||
Revision as of 23:55, 16 June 2022
IOP OS is a set of functions in IOS's networking code that convert Revolution OS calls to IOS syscalls; for example, OSAlloc is implemented as a call to IOS_Alloc.
Toggling interrupts
Disabling interrupts is simulated by locking a mutex implemented as a message queue and changing the current thread priority to 0x38. While this does not completely prevent concurrent execution within the module,[check] it is enough for most uses of OSDisableInterrupts.
Threads
Threads are implemented as a proxy to IOS threads. Because of this, OSThreadQueue is only used for suspended queues.
struct OSThread {
int threadId;
int priority;
void *threadSpecific;
struct OSThread *next;
}
struct OSThreadQueue {
struct OSThread *head;
struct OSThread *tail;
}