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Improve the fake interrupt stuff on the sim a bit.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15349 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2007-10-28 16:49:02 +00:00
parent 7807279eaf
commit a8eeff0fee
1 changed files with 9 additions and 1 deletions
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10
uisimulator/sdl/kernel.c
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@ -34,6 +34,7 @@ static SDL_cond *sim_thread_cond;
* inside a handler */
static SDL_mutex *sim_irq_mtx;
static int interrupt_level = HIGHEST_IRQ_LEVEL;
static int handlers_pending = 0;
static int status_reg = 0;
extern struct core_entry cores[NUM_CORES];
@ -53,7 +54,8 @@ int set_irq_level(int level)
if (status_reg == 0 && level == 0 && oldlevel != 0)
{
/* Not in a handler and "interrupts" are being reenabled */
SDL_CondSignal(sim_thread_cond);
if (handlers_pending > 0)
SDL_CondSignal(sim_thread_cond);
}
interrupt_level = level; /* save new level */
@ -65,16 +67,22 @@ int set_irq_level(int level)
void sim_enter_irq_handler(void)
{
SDL_LockMutex(sim_irq_mtx);
handlers_pending++;
if(interrupt_level != 0)
{
/* "Interrupts" are disabled. Wait for reenable */
SDL_CondWait(sim_thread_cond, sim_irq_mtx);
}
status_reg = 1;
}
void sim_exit_irq_handler(void)
{
if (--handlers_pending > 0)
SDL_CondSignal(sim_thread_cond);
status_reg = 0;
SDL_UnlockMutex(sim_irq_mtx);
}