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Implement cooperative threads on hosted platforms using C code.

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This replaces SDL threads with real cooperative threads, which are less cpu intensive and allow priority scheduling.
The backend for context switching is dependant on the host (sigaltstack/longjmp on Unix, Fibers on Windows).
configure has options to force or disallow SDL threads.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29327 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thomas Martitz 2011-02-18 22:46:01 +00:00
parent 3926c30705
commit 6d85de3419
13 changed files with 580 additions and 27 deletions
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27
firmware/export/thread.h
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@ -84,15 +84,19 @@
* We need more stack when we run under a host
* maybe more expensive C lib functions?
*
* simulator doesn't simulate stack usage anyway but well ... */
#if ((CONFIG_PLATFORM & PLATFORM_NATIVE) || defined(SIMULATOR))
#define DEFAULT_STACK_SIZE 0x400 /* Bytes */
#else
* simulator (possibly) doesn't simulate stack usage anyway but well ... */
#ifdef HAVE_SIGALTSTACK_THREADS
#include <signal.h>
/* MINSIGSTKSZ for the OS to deliver the signal + 0x3000 for us */
#define DEFAULT_STACK_SIZE (MINSIGSTKSZ+0x3000) /* Bytes */
#elif (CONFIG_PLATFORM & PLATFORM_ANDROID) || defined(HAVE_WIN32_FIBER_THREADS)
#define DEFAULT_STACK_SIZE 0x1000 /* Bytes */
#else /* native threads, sdl threads */
#define DEFAULT_STACK_SIZE 0x400 /* Bytes */
#endif
#if (CONFIG_PLATFORM & (PLATFORM_NATIVE|PLATFORM_ANDROID))
#if defined(ASSEMBLER_THREADS)
/* Need to keep structures inside the header file because debug_menu
* needs them. */
#ifdef CPU_COLDFIRE
@ -112,7 +116,7 @@ struct regs
uint32_t pr; /* 32 - Procedure register */
uint32_t start; /* 36 - Thread start address, or NULL when started */
};
#elif defined(CPU_ARM) || (CONFIG_PLATFORM & PLATFORM_ANDROID)
#elif defined(CPU_ARM)
struct regs
{
uint32_t r[8]; /* 0-28 - Registers r4-r11 */
@ -147,6 +151,16 @@ struct regs
};
#endif /* CONFIG_CPU */
#elif (CONFIG_PLATFORM & PLATFORM_HOSTED)
#ifndef HAVE_SDL_THREADS
struct regs
{
void (*start)(void); /* thread's entry point, or NULL when started */
void* uc; /* host thread handle */
uintptr_t sp; /* Stack pointer, unused */
size_t stack_size; /* stack size, not always used */
uintptr_t stack; /* pointer to start of the stack buffer */
};
#else /* SDL threads */
struct regs
{
void *t; /* OS thread */
@ -154,6 +168,7 @@ struct regs
void *s; /* Semaphore for blocking and wakeup */
void (*start)(void); /* Start function */
};
#endif
#endif /* PLATFORM_NATIVE */
/* NOTE: The use of the word "queue" may also refer to a linked list of