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Add partial thread safety to GCC 

Add lock functions so that malloc and environment variable access are
thread safe.  Add the compiler option "-o thread-safe" to use the full
version of newlib which is thread safe.

Note that this patch does NOT make file access thread safe.
pull/1765/head
Russ Butler 2016-05-23 20:59:02 -05:00 committed by Russ Butler
parent bd216c37cb
commit 793f9c566a
2 changed files with 32 additions and 1 deletions
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30
rtos/rtx/TARGET_CORTEX_M/RTX_CM_lib.h
View File

@ -624,11 +624,18 @@ __asm void __rt_entry (void) {
#elif defined (__GNUC__)
osMutexDef(malloc_mutex);
static osMutexId malloc_mutex_id;
osMutexDef(env_mutex);
static osMutexId env_mutex_id;
extern void __libc_fini_array(void);
extern void __libc_init_array (void);
extern int main(int argc, char **argv);
void pre_main(void) {
malloc_mutex_id = osMutexCreate(osMutex(malloc_mutex));
env_mutex_id = osMutexCreate(osMutex(env_mutex));
atexit(__libc_fini_array);
__libc_init_array();
main(0, NULL);
@ -651,6 +658,29 @@ __attribute__((naked)) void software_init_hook (void) {
);
}
// Opaque declaration of _reent structure
struct _reent;
void __malloc_lock( struct _reent *_r )
{
osMutexWait(malloc_mutex_id, osWaitForever);
}
void __malloc_unlock( struct _reent *_r )
{
osMutexRelease(malloc_mutex_id);
}
void __env_lock( struct _reent *_r )
{
osMutexWait(env_mutex_id, osWaitForever);
}
void __env_unlock( struct _reent *_r )
{
osMutexRelease(env_mutex_id);
}
#elif defined (__ICCARM__)
extern void* __vector_table;

3
workspace_tools/toolchains/gcc.py
View File

@ -183,7 +183,8 @@ class GCC_ARM(GCC):
GCC.__init__(self, target, options, notify, macros, silent, GCC_ARM_PATH, extra_verbose=extra_verbose)
# Use latest gcc nanolib
self.ld.append("--specs=nano.specs")
if "thread-safe" not in self.options:
self.ld.append("--specs=nano.specs")
if target.name in ["LPC1768", "LPC4088", "LPC4088_DM", "LPC4330", "UBLOX_C027", "LPC2368"]:
self.ld.extend(["-u _printf_float", "-u _scanf_float"])
elif target.name in ["RZ_A1H", "VK_RZ_A1H", "ARCH_MAX", "DISCO_F407VG", "DISCO_F429ZI", "DISCO_F469NI", "NUCLEO_F401RE", "NUCLEO_F410RB", "NUCLEO_F411RE", "NUCLEO_F446RE", "ELMO_F411RE", "MTS_MDOT_F411RE", "MTS_DRAGONFLY_F411RE", "DISCO_F746NG"]: