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Implement cooperative threads on hosted platforms using C code.

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

4
firmware/SOURCES
View file

@ -37,7 +37,11 @@ target/hosted/sdl/lcd-remote-bitmap.c
#endif
target/hosted/sdl/lcd-sdl.c
target/hosted/sdl/system-sdl.c
#ifdef HAVE_SDL_THREADS
target/hosted/sdl/thread-sdl.c
#else
thread.c
#endif
target/hosted/sdl/timer-sdl.c
#ifdef HAVE_TOUCHSCREEN
target/hosted/sdl/key_to_touch-sdl.c

4
firmware/export/config.h
View file

@ -717,7 +717,9 @@ Lyre prototype 1 */
#define HAVE_WAKEUP_EXT_CB
#if (CONFIG_PLATFORM & PLATFORM_ANDROID)
#if defined(ASSEMBLER_THREADS) \
|| defined(HAVE_WIN32_FIBER_THREADS) \
|| defined(HAVE_SIGALTSTACK_THREADS)
#define HAVE_PRIORITY_SCHEDULING
#endif

27
firmware/export/thread.h
View file

@ -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

60
firmware/target/hosted/sdl/kernel-sdl.c
View file

@ -34,6 +34,14 @@
static SDL_TimerID tick_timer_id;
long start_tick;
#ifndef HAVE_SDL_THREADS
/* for the wait_for_interrupt function */
static bool do_exit;
static SDL_cond *wfi_cond;
static SDL_mutex *wfi_mutex;
#else
#define do_exit false
#endif
/* Condition to signal that "interrupts" may proceed */
static SDL_cond *sim_thread_cond;
/* Mutex to serialize changing levels and exclude other threads while
@ -98,6 +106,9 @@ void sim_exit_irq_handler(void)
status_reg = 0;
SDL_UnlockMutex(sim_irq_mtx);
#ifndef HAVE_SDL_THREADS
SDL_CondSignal(wfi_cond);
#endif
}
static bool sim_kernel_init(void)
@ -115,13 +126,31 @@ static bool sim_kernel_init(void)
panicf("Cannot create sim_thread_cond\n");
return false;
}
#ifndef HAVE_SDL_THREADS
wfi_cond = SDL_CreateCond();
if (wfi_cond == NULL)
{
panicf("Cannot create wfi\n");
return false;
}
wfi_mutex = SDL_CreateMutex();
if (wfi_mutex == NULL)
{
panicf("Cannot create wfi mutex\n");
return false;
}
#endif
return true;
}
void sim_kernel_shutdown(void)
{
SDL_RemoveTimer(tick_timer_id);
#ifndef HAVE_SDL_THREADS
do_exit = true;
SDL_CondSignal(wfi_cond);
#endif
disable_irq();
SDL_DestroyMutex(sim_irq_mtx);
SDL_DestroyCond(sim_thread_cond);
}
@ -135,7 +164,7 @@ Uint32 tick_timer(Uint32 interval, void *param)
new_tick = (SDL_GetTicks() - start_tick) / (1000/HZ);
while(new_tick != current_tick)
while(new_tick != current_tick && !do_exit)
{
sim_enter_irq_handler();
@ -146,7 +175,7 @@ Uint32 tick_timer(Uint32 interval, void *param)
sim_exit_irq_handler();
}
return interval;
return do_exit ? 0 : interval;
}
void tick_start(unsigned int interval_in_ms)
@ -168,4 +197,29 @@ void tick_start(unsigned int interval_in_ms)
}
tick_timer_id = SDL_AddTimer(interval_in_ms, tick_timer, NULL);
#ifndef HAVE_SDL_THREADS
SDL_LockMutex(wfi_mutex);
#endif
}
#ifndef HAVE_SDL_THREADS
static void check_exit(void)
{
if (UNLIKELY(do_exit))
{
SDL_DestroyCond(wfi_cond);
SDL_UnlockMutex(wfi_mutex);
SDL_DestroyMutex(wfi_mutex);
sim_do_exit();
}
}
void wait_for_interrupt(void)
{
/* the exit may come at any time, during the CondWait or before,
* so check it twice */
check_exit();
SDL_CondWait(wfi_cond, wfi_mutex);
check_exit();
}
#endif

21
firmware/target/hosted/sdl/system-sdl.c
View file

@ -184,7 +184,9 @@ static int sdl_event_thread(void * param)
/* Order here is relevent to prevent deadlocks and use of destroyed
sync primitives by kernel threads */
sim_thread_shutdown();
#ifdef HAVE_SDL_THREADS
sim_thread_shutdown(); /* not needed for native threads */
#endif
sim_kernel_shutdown();
return 0;
@ -199,9 +201,13 @@ void sim_do_exit(void)
exit(EXIT_SUCCESS);
}
uintptr_t *stackbegin;
uintptr_t *stackend;
void system_init(void)
{
SDL_sem *s;
/* fake stack, OS manages size (and growth) */
stackbegin = stackend = (uintptr_t*)&s;
#if (CONFIG_PLATFORM & PLATFORM_MAEMO)
/* Make glib thread safe */
@ -219,21 +225,24 @@ void system_init(void)
/* wait for sdl_event_thread to run so that it can initialize the surfaces
* and video subsystem needed for SDL events */
SDL_SemWait(s);
/* cleanup */
SDL_DestroySemaphore(s);
}
void system_exception_wait(void)
{
sim_thread_exception_wait();
}
void system_reboot(void)
{
#ifdef HAVE_SDL_THREADS
sim_thread_exception_wait();
#else
sim_do_exit();
#endif
}
void system_exception_wait(void)
{
system_reboot();
}
void sys_handle_argv(int argc, char *argv[])
{

3
firmware/target/hosted/sdl/system-sdl.h
View file

@ -46,6 +46,9 @@ void sys_poweroff(void);
void sys_handle_argv(int argc, char *argv[]);
void gui_message_loop(void);
void sim_do_exit(void);
#ifndef HAVE_SDL_THREADS
void wait_for_interrupt(void);
#endif
extern bool background; /* True if the background image is enabled */
extern bool showremote;

2
firmware/target/hosted/sdl/thread-sdl.h
View file

@ -22,11 +22,13 @@
#ifndef __THREADSDL_H__
#define __THREADSDL_H__
#ifdef HAVE_SDL_THREADS
/* extra thread functions that only apply when running on hosting platforms */
void sim_thread_lock(void *me);
void * sim_thread_unlock(void);
void sim_thread_exception_wait(void);
void sim_thread_shutdown(void); /* Shut down all kernel threads gracefully */
#endif
#endif /* #ifndef __THREADSDL_H__ */

8
firmware/target/hosted/android/thread-android-arm.c → firmware/target/hosted/thread-arm.c
View file

@ -22,7 +22,6 @@
*
****************************************************************************/
#include <jni.h>
#include <system.h>
/*---------------------------------------------------------------------------
* Start the thread running and terminate it if it returns
@ -84,14 +83,15 @@ static inline void load_context(const void* addr)
* this core sleep suspends the OS thread rockbox runs under, which greatly
* reduces cpu usage (~100% to <10%)
*
* it returns when the RockboxTimer notified us, i.e. at each tick
* (after it called the tick tasks)
* it returns when when the tick timer is called, other interrupt-like
* events occur
*
* wait_for_interrupt is implemented in kernel-android.c
* wait_for_interrupt is implemented in kernel-<platform>.c
**/
static inline void core_sleep(void)
{
enable_irq();
wait_for_interrupt();
}

294
firmware/target/hosted/thread-unix.c Normal file
View file

@ -0,0 +1,294 @@
#include <stdlib.h>
#include <stdbool.h>
#include <signal.h>
#include <stdio.h>
#include <setjmp.h>
#include <unistd.h>
#include <pthread.h>
#include <errno.h>
#include "debug.h"
static volatile bool sig_handler_called;
static volatile jmp_buf tramp_buf;
static volatile jmp_buf bootstrap_buf;
static void (*thread_func)(void);
static const int trampoline_sig = SIGUSR1;
static pthread_t main_thread;
static struct ctx {
jmp_buf thread_buf;
} thread_bufs[MAXTHREADS];
static struct ctx* thread_context, *target_context;
static int curr_uc;
static void trampoline(int sig);
static void bootstrap_context(void) __attribute__((noinline));
/* The *_context functions are heavily based on Gnu pth
* http://www.gnu.org/software/pth/
*
* adjusted to work in a multi-thread environment to
* offer a ucontext-like API
*/
/*
* VARIANT 2: THE SIGNAL STACK TRICK
*
* This uses sigstack/sigaltstack() and friends and is really the
* most tricky part of Pth. When you understand the following
* stuff you're a good Unix hacker and then you've already
* understood the gory ingredients of Pth. So, either welcome to
* the club of hackers, or do yourself a favor and skip this ;)
*
* The ingenious fact is that this variant runs really on _all_ POSIX
* compliant systems without special platform kludges. But be _VERY_
* carefully when you change something in the following code. The slightest
* change or reordering can lead to horribly broken code. Really every
* function call in the following case is intended to be how it is, doubt
* me...
*
* For more details we strongly recommend you to read the companion
* paper ``Portable Multithreading -- The Signal Stack Trick for
* User-Space Thread Creation'' from Ralf S. Engelschall. A copy of the
* draft of this paper you can find in the file rse-pmt.ps inside the
* GNU Pth distribution.
*/
static int make_context(struct ctx *ctx, void (*f)(void), char *sp, size_t stack_size)
{
struct sigaction sa;
struct sigaction osa;
stack_t ss;
stack_t oss;
sigset_t osigs;
sigset_t sigs;
disable_irq();
/*
* Preserve the trampoline_sig signal state, block trampoline_sig,
* and establish our signal handler. The signal will
* later transfer control onto the signal stack.
*/
sigemptyset(&sigs);
sigaddset(&sigs, trampoline_sig);
sigprocmask(SIG_BLOCK, &sigs, &osigs);
sa.sa_handler = trampoline;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_ONSTACK;
if (sigaction(trampoline_sig, &sa, &osa) != 0)
{
DEBUGF("%s(): %s\n", __func__, strerror(errno));
return false;
}
/*
* Set the new stack.
*
* For sigaltstack we're lucky [from sigaltstack(2) on
* FreeBSD 3.1]: ``Signal stacks are automatically adjusted
* for the direction of stack growth and alignment
* requirements''
*
* For sigstack we have to decide ourself [from sigstack(2)
* on Solaris 2.6]: ``The direction of stack growth is not
* indicated in the historical definition of struct sigstack.
* The only way to portably establish a stack pointer is for
* the application to determine stack growth direction.''
*/
ss.ss_sp = sp;
ss.ss_size = stack_size;
ss.ss_flags = 0;
if (sigaltstack(&ss, &oss) < 0)
{
DEBUGF("%s(): %s\n", __func__, strerror(errno));
return false;
}
/*
* Now transfer control onto the signal stack and set it up.
* It will return immediately via "return" after the setjmp()
* was performed. Be careful here with race conditions. The
* signal can be delivered the first time sigsuspend() is
* called.
*/
sig_handler_called = false;
main_thread = pthread_self();
sigfillset(&sigs);
sigdelset(&sigs, trampoline_sig);
pthread_kill(main_thread, trampoline_sig);
while(!sig_handler_called)
sigsuspend(&sigs);
/*
* Inform the system that we are back off the signal stack by
* removing the alternative signal stack. Be careful here: It
* first has to be disabled, before it can be removed.
*/
sigaltstack(NULL, &ss);
ss.ss_flags = SS_DISABLE;
if (sigaltstack(&ss, NULL) < 0)
{
DEBUGF("%s(): %s\n", __func__, strerror(errno));
return false;
}
sigaltstack(NULL, &ss);
if (!(ss.ss_flags & SS_DISABLE))
{
DEBUGF("%s(): %s\n", __func__, strerror(errno));
return false;
}
if (!(oss.ss_flags & SS_DISABLE))
sigaltstack(&oss, NULL);
/*
* Restore the old trampoline_sig signal handler and mask
*/
sigaction(trampoline_sig, &osa, NULL);
sigprocmask(SIG_SETMASK, &osigs, NULL);
/*
* Tell the trampoline and bootstrap function where to dump
* the new machine context, and what to do afterwards...
*/
thread_func = f;
thread_context = ctx;
/*
* Now enter the trampoline again, but this time not as a signal
* handler. Instead we jump into it directly. The functionally
* redundant ping-pong pointer arithmentic is neccessary to avoid
* type-conversion warnings related to the `volatile' qualifier and
* the fact that `jmp_buf' usually is an array type.
*/
if (setjmp(*((jmp_buf *)&bootstrap_buf)) == 0)
longjmp(*((jmp_buf *)&tramp_buf), 1);
/*
* Ok, we returned again, so now we're finished
*/
enable_irq();
return true;
}
static void trampoline(int sig)
{
(void)sig;
/* sanity check, no other thread should be here */
if (pthread_self() != main_thread)
return;
if (setjmp(*((jmp_buf *)&tramp_buf)) == 0)
{
sig_handler_called = true;
return;
}
/* longjump'd back in */
bootstrap_context();
}
void bootstrap_context(void)
{
/* copy to local storage so we can spawn further threads
* in the meantime */
void (*thread_entry)(void) = thread_func;
struct ctx *t = thread_context;
/*
* Save current machine state (on new stack) and
* go back to caller until we're scheduled for real...
*/
if (setjmp(t->thread_buf) == 0)
longjmp(*((jmp_buf *)&bootstrap_buf), 1);
/*
* The new thread is now running: GREAT!
* Now we just invoke its init function....
*/
thread_entry();
DEBUGF("thread left\n");
thread_exit();
}
static inline void set_context(struct ctx *c)
{
longjmp(c->thread_buf, 1);
}
static inline void swap_context(struct ctx *old, struct ctx *new)
{
if (setjmp(old->thread_buf) == 0)
longjmp(new->thread_buf, 1);
}
static inline void get_context(struct ctx *c)
{
setjmp(c->thread_buf);
}
static void setup_thread(struct regs *context);
#define INIT_MAIN_THREAD
static void init_main_thread(void *addr)
{
/* get a context for the main thread so that we can jump to it from
* other threads */
struct regs *context = (struct regs*)addr;
context->uc = &thread_bufs[curr_uc++];
get_context(context->uc);
}
#define THREAD_STARTUP_INIT(core, thread, function) \
({ (thread)->context.stack_size = (thread)->stack_size, \
(thread)->context.stack = (uintptr_t)(thread)->stack; \
(thread)->context.start = function; })
/*
* Prepare context to make the thread runnable by calling swapcontext on it
*/
static void setup_thread(struct regs *context)
{
void (*fn)(void) = context->start;
context->uc = &thread_bufs[curr_uc++];
while (!make_context(context->uc, fn, (char*)context->stack, context->stack_size))
DEBUGF("Thread creation failed. Retrying");
}
/*
* Save the ucontext_t pointer for later use in swapcontext()
*
* Cannot do getcontext() here, because jumping back to the context
* resumes after the getcontext call (i.e. store_context), but we need
* to resume from load_context()
*/
static inline void store_context(void* addr)
{
struct regs *r = (struct regs*)addr;
target_context = r->uc;
}
/*
* Perform context switch
*/
static inline void load_context(const void* addr)
{
struct regs *r = (struct regs*)addr;
if (UNLIKELY(r->start))
{
setup_thread(r);
r->start = NULL;
}
swap_context(target_context, r->uc);
}
/*
* play nice with the host and sleep while waiting for the tick */
extern void wait_for_interrupt(void);
static inline void core_sleep(void)
{
enable_irq();
wait_for_interrupt();
}

85
firmware/target/hosted/thread-win32.c Normal file
View file

@ -0,0 +1,85 @@
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2010 by Thomas Martitz
*
* Generic ARM threading support
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <windows.h>
#include "system.h"
#define INIT_MAIN_THREAD
#define THREAD_STARTUP_INIT(core, thread, function) \
({ (thread)->context.stack_size = (thread)->stack_size, \
(thread)->context.stack = (uintptr_t)(thread)->stack; \
(thread)->context.start = function; })
static void init_main_thread(void *addr)
{
struct regs *context = (struct regs*)addr;
/* we must convert the current main thread to a fiber to be able to
* schedule other fibers */
context->uc = ConvertThreadToFiber(NULL);
context->stack_size = 0;
}
static inline void store_context(void* addr)
{
(void)addr;
/* nothing to do here, Fibers continue after the SwitchToFiber call */
}
static void start_thread(void)
{
void (*func)(void) = GetFiberData();
func();
/* go out if thread function returns */
thread_exit();
}
/*
* Load context and run it
*
* Resume execution from the last load_context call for the thread
*/
static inline void load_context(const void* addr)
{
struct regs *context = (struct regs*)addr;
if (UNLIKELY(context->start))
{ /* need setup before switching to it */
context->uc = CreateFiber(context->stack_size,
(LPFIBER_START_ROUTINE)start_thread, context->start);
/* can't assign stack pointer, only stack size */
context->stack_size = 0;
context->start = NULL;
}
SwitchToFiber(context->uc);
}
/*
* play nice with the host and sleep while waiting for the tick */
static inline void core_sleep(void)
{
enable_irq();
wait_for_interrupt();
}

12
firmware/thread.c
View file

@ -174,10 +174,13 @@ void switch_thread(void)
__attribute__((noinline));
/****************************************************************************
* Processor-specific section - include necessary core support
* Processor/OS-specific section - include necessary core support
*/
#if defined(ANDROID)
#include "thread-android-arm.c"
#if defined(HAVE_WIN32_FIBER_THREADS)
#include "thread-win32.c"
#elif defined(HAVE_SIGALTSTACK_THREADS)
#include "thread-unix.c"
#elif defined(CPU_ARM)
#include "thread-arm.c"
#if defined (CPU_PP)
@ -2308,6 +2311,9 @@ void init_threads(void)
thread_exit();
#endif /* NUM_CORES */
}
#ifdef INIT_MAIN_THREAD
init_main_thread(&thread->context);
#endif
}
/* Shared stack scan helper for thread_stack_usage and idle_stack_usage */

78
tools/configure vendored
View file

@ -25,6 +25,7 @@ bindir=
libdir=
sharedir=
thread_support="ASSEMBLER_THREADS"
app_modelname=
app_lcd_width=
app_lcd_height=
@ -163,6 +164,39 @@ findsdl(){
done
}
# check for availability of sigaltstack to support our thread engine
check_sigaltstack() {
cat >$tmpdir/check_threads.c <<EOF
#include <signal.h>
int main(int argc, char **argv)
{
#define NULL (void*)0
sigaltstack(NULL, NULL);
return 0;
}
EOF
$CC -o $tmpdir/check_threads $tmpdir/check_threads.c 1> /dev/null
result=$?
rm -rf $tmpdir/check_threads*
echo $result
}
# check for availability of Fiber on Win32 to support our thread engine
check_fiber() {
cat >$tmpdir/check_threads.c <<EOF
#include <windows.h>
int main(int argc, char **argv)
{
ConvertThreadToFiber(NULL);
return 0;
}
EOF
$CC -o $tmpdir/check_threads $tmpdir/check_threads.c 2>/dev/null
result=$?
rm -rf $tmpdir/check_threads*
echo $result
}
simcc () {
# default tool setup for native building
@ -175,6 +209,8 @@ simcc () {
GCCOPTS="$GCCOPTS -fno-builtin -g"
GCCOPTIMIZE=''
LDOPTS='-lm' # button-sdl.c uses sqrt()
sigaltstack=""
fibers=""
# default output binary name, don't override app_get_platform()
if [ "$app_type" != "sdl-app" ]; then
@ -193,6 +229,7 @@ simcc () {
CYGWIN*)
echo "Cygwin host detected"
fibers=`check_fiber`
LDOPTS="$LDOPTS -mconsole"
output="$output.exe"
winbuild="yes"
@ -201,29 +238,33 @@ simcc () {
MINGW*)
echo "MinGW host detected"
fibers=`check_fiber`
LDOPTS="$LDOPTS -mconsole"
output="$output.exe"
winbuild="yes"
;;
Linux)
sigaltstack=`check_sigaltstack`
echo "Linux host detected"
LDOPTS="$LDOPTS -ldl"
;;
FreeBSD)
sigaltstack=`check_sigaltstack`
echo "FreeBSD host detected"
LDOPTS="$LDOPTS -ldl"
;;
Darwin)
sigaltstack=`check_sigaltstack`
echo "Darwin host detected"
LDOPTS="$LDOPTS -ldl"
SHARED_FLAG="-dynamiclib -Wl\,-single_module"
;;
SunOS)
sigaltstack=`check_sigaltstack`
echo "*Solaris host detected"
GCCOPTS="$GCCOPTS -fPIC"
@ -319,11 +360,33 @@ EOF
# add cross-compiler option(s)
prefixtools i586-mingw32msvc-
LDOPTS="$LDOPTS -mconsole"
fibers=`check_fiber`
output="rockboxui.exe"
endian="little" # windows is little endian
echo "Enabling MMX support"
GCCOPTS="$GCCOPTS -mmmx"
fi
thread_support=
if [ -z "$ARG_THREAD_SUPPORT" ] || [ "$ARG_THREAD_SUPPORT" = "0" ]; then
if [ "$sigaltstack" = "0" ]; then
thread_support="HAVE_SIGALTSTACK_THREADS"
echo "Selected sigaltstack threads"
elif [ "$fibers" = "0" ]; then
thread_support="HAVE_WIN32_FIBER_THREADS"
echo "Selected Win32 Fiber threads"
fi
fi
if [ -n `echo $app_type | grep "sdl"` ] && [ -z "$thread_support" ] \
&& [ "$ARG_THREAD_SUPPORT" != "0" ]; then
thread_support="HAVE_SDL_THREADS"
if [ "$ARG_THREAD_SUPPORT" = "1" ]; then
echo "Selected SDL threads"
else
echo "WARNING: Falling back to SDL threads"
fi
fi
}
#
@ -994,6 +1057,11 @@ help() {
--thumb Build with -mthumb (for ARM builds)
--no-thumb The opposite of --thumb (don't use thumb even for targets
where this is the default
--sdl-threads Force use of SDL threads. They have inferior performance,
but are better debuggable with GDB
--no-sdl-threads Disallow use of SDL threads. This prevents the default
behavior of falling back to them if no native thread
support was found.
--prefix Target installation directory
--help Shows this message (must not be used with other options)
@ -1015,6 +1083,7 @@ ARG_VOICE=
ARG_ARM_EABI=
ARG_ARM_THUMB=
ARG_PREFIX="$PREFIX"
ARG_THREAD_SUPPORT=
err=
for arg in "$@"; do
case "$arg" in
@ -1035,6 +1104,9 @@ for arg in "$@"; do
--no-eabi) ARG_ARM_EABI=0;;
--thumb) ARG_ARM_THUMB=1;;
--no-thumb) ARG_ARM_THUMB=0;;
--sdl-threads)ARG_THREAD_SUPPORT=1;;
--no-sdl-threads)
ARG_THREAD_SUPPORT=0;;
--prefix=*) ARG_PREFIX=`echo "$arg" | cut -d = -f 2`;;
--help) help;;
*) err=1; echo "[ERROR] Option '$arg' unsupported";;
@ -3326,6 +3398,7 @@ sed > autoconf.h \
-e "s<^#undef DO_BOOTCHART<$use_bootchart<g" \
-e "s<@config_rtc@<$config_rtc<g" \
-e "s<@have_rtc_alarm@<$have_rtc_alarm<g" \
-e "s<@thread_support@<$thread_support<g" \
-e "s<@RBDIR@<${rbdir}<g" \
-e "s<@sharepath@<${sharedir}<g" \
-e "s<@binpath@<${bindir}<g" \
@ -3362,6 +3435,9 @@ sed > autoconf.h \
@config_rtc@
@have_rtc_alarm@
/* the threading backend we use */
#define @thread_support@
/* lcd dimensions for application builds from configure */
@lcd_width@
@lcd_height@

7
uisimulator/common/io.c
View file

@ -46,9 +46,12 @@
#endif
#include <fcntl.h>
#include <SDL.h>
#include <SDL_thread.h>
#ifdef HAVE_SDL_THREADS
#include "thread-sdl.h"
#else
#define sim_thread_unlock() NULL
#define sim_thread_lock(a)
#endif
#include "thread.h"
#include "kernel.h"
#include "debug.h"