esp-idf/components/freertos/portmux_impl.inc.h

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/*
Copyright (C) 2016-2017 Espressif Shanghai PTE LTD
Copyright (C) 2015 Real Time Engineers Ltd.
All rights reserved
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
***************************************************************************
>>! NOTE: The modification to the GPL is included to allow you to !<<
>>! distribute a combined work that includes FreeRTOS without being !<<
>>! obliged to provide the source code for proprietary components !<<
>>! outside of the FreeRTOS kernel. !<<
***************************************************************************
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. Full license text is available on the following
link: http://www.freertos.org/a00114.html
*/
/*
Warning: funky preprocessor hackery ahead. Including these headers will generate two
functions, which names are defined by the preprocessor macros
PORTMUX_AQUIRE_MUX_FN_NAME and PORTMUX_RELEASE_MUX_FN_NAME. In order to do the compare
and exchange function, they will use whatever PORTMUX_COMPARE_SET_FN_NAME resolves to.
In some scenarios, this header is included *twice* in portmux_impl.h: one time
for the 'normal' mux code which uses a compare&exchange routine, another time
to generate code for a second set of these routines that use a second mux
(in internal ram) to fake a compare&exchange on a variable in external memory.
*/
static inline bool __attribute__((always_inline))
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
PORTMUX_AQUIRE_MUX_FN_NAME(portMUX_TYPE *mux, int timeout_cycles, const char *fnName, int line) {
#else
PORTMUX_AQUIRE_MUX_FN_NAME(portMUX_TYPE *mux, int timeout_cycles) {
#endif
#if !CONFIG_FREERTOS_UNICORE
uint32_t res;
portBASE_TYPE coreID, otherCoreID;
uint32_t ccount_start;
bool set_timeout = timeout_cycles > portMUX_NO_TIMEOUT;
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
if (!set_timeout) {
timeout_cycles = 10000; // Always set a timeout in debug mode
set_timeout = true;
}
#endif
if (set_timeout) { // Timeout
RSR(CCOUNT, ccount_start);
}
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
uint32_t owner = mux->owner;
if (owner != portMUX_FREE_VAL && owner != CORE_ID_PRO && owner != CORE_ID_APP) {
ets_printf("ERROR: vPortCPUAcquireMutex: mux %p is uninitialized (0x%X)! Called from %s line %d.\n", mux, owner, fnName, line);
mux->owner=portMUX_FREE_VAL;
}
#endif
/* Spin until we own the core */
RSR(PRID, coreID);
/* Note: coreID is the full 32 bit core ID (CORE_ID_PRO/CORE_ID_APP),
not the 0/1 value returned by xPortGetCoreID()
*/
otherCoreID = CORE_ID_XOR_SWAP ^ coreID;
do {
/* mux->owner should be one of portMUX_FREE_VAL, CORE_ID_PRO,
CORE_ID_APP:
- If portMUX_FREE_VAL, we want to atomically set to 'coreID'.
- If "our" coreID, we can drop through immediately.
- If "otherCoreID", we spin here.
*/
res = coreID;
PORTMUX_COMPARE_SET_FN_NAME(&mux->owner, portMUX_FREE_VAL, &res);
if (res != otherCoreID) {
break; // mux->owner is "our" coreID
}
if (set_timeout) {
uint32_t ccount_now;
RSR(CCOUNT, ccount_now);
if (ccount_now - ccount_start > (unsigned)timeout_cycles) {
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
ets_printf("Timeout on mux! last non-recursive lock %s line %d, curr %s line %d\n", mux->lastLockedFn, mux->lastLockedLine, fnName, line);
ets_printf("Owner 0x%x count %d\n", mux->owner, mux->count);
#endif
return false;
}
}
} while (1);
assert(res == coreID || res == portMUX_FREE_VAL); /* any other value implies memory corruption or uninitialized mux */
assert((res == portMUX_FREE_VAL) == (mux->count == 0)); /* we're first to lock iff count is zero */
assert(mux->count < 0xFF); /* Bad count value implies memory corruption */
/* now we own it, we can increment the refcount */
mux->count++;
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
if (res==portMUX_FREE_VAL) { //initial lock
mux->lastLockedFn=fnName;
mux->lastLockedLine=line;
} else {
ets_printf("Recursive lock: count=%d last non-recursive lock %s line %d, curr %s line %d\n", mux->count-1,
mux->lastLockedFn, mux->lastLockedLine, fnName, line);
}
#endif /* CONFIG_FREERTOS_PORTMUX_DEBUG */
#endif /* CONFIG_FREERTOS_UNICORE */
return true;
}
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
static inline void PORTMUX_RELEASE_MUX_FN_NAME(portMUX_TYPE *mux, const char *fnName, int line) {
#else
static inline void PORTMUX_RELEASE_MUX_FN_NAME(portMUX_TYPE *mux) {
#endif
#if !CONFIG_FREERTOS_UNICORE
portBASE_TYPE coreID;
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
const char *lastLockedFn=mux->lastLockedFn;
int lastLockedLine=mux->lastLockedLine;
mux->lastLockedFn=fnName;
mux->lastLockedLine=line;
uint32_t owner = mux->owner;
if (owner != portMUX_FREE_VAL && owner != CORE_ID_PRO && owner != CORE_ID_APP) {
ets_printf("ERROR: vPortCPUReleaseMutex: mux %p is invalid (0x%x)!\n", mux, mux->owner);
}
#endif
#if CONFIG_FREERTOS_PORTMUX_DEBUG || !defined(NDEBUG)
RSR(PRID, coreID);
#endif
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
if (coreID != mux->owner) {
ets_printf("ERROR: vPortCPUReleaseMutex: mux %p was already unlocked!\n", mux);
ets_printf("Last non-recursive unlock %s line %d, curr unlock %s line %d\n", lastLockedFn, lastLockedLine, fnName, line);
}
#endif
assert(coreID == mux->owner); // This is a mutex we didn't lock, or it's corrupt
mux->count--;
if(mux->count == 0) {
mux->owner = portMUX_FREE_VAL;
} else {
assert(mux->count < 0x100); // Indicates memory corruption
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG_RECURSIVE
ets_printf("Recursive unlock: count=%d last locked %s line %d, curr %s line %d\n", mux->count, lastLockedFn, lastLockedLine, fnName, line);
#endif
}
#endif //!CONFIG_FREERTOS_UNICORE
}