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authorThomas Martitz <kugel@rockbox.org>2011-02-18 22:46:01 +0000
committerThomas Martitz <kugel@rockbox.org>2011-02-18 22:46:01 +0000
commit6d85de341928aef8178465c60122f3cbe76f5dd6 (patch)
treeff86c384a574ac20d3418c1b904ed4d0de1f6980 /firmware/export/thread.h
parent3926c30705cc7235122e2f2e35ab506b53238cdf (diff)
downloadrockbox-6d85de341928aef8178465c60122f3cbe76f5dd6.tar.gz
rockbox-6d85de341928aef8178465c60122f3cbe76f5dd6.zip
Implement cooperative threads on hosted platforms using C code.
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
Diffstat (limited to 'firmware/export/thread.h')
-rw-r--r--firmware/export/thread.h27
1 files changed, 21 insertions, 6 deletions
diff --git a/firmware/export/thread.h b/firmware/export/thread.h
index 3cce78444c..4f7631cebd 100644
--- a/firmware/export/thread.h
+++ b/firmware/export/thread.h
@@ -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