/******************************************************************************
Welcome to GDB Online.
GDB online is an online compiler and debugger tool for C, C++, Python, PHP, Ruby,
C#, VB, Perl, Swift, Prolog, Javascript, Pascal, HTML, CSS, JS
Code, Compile, Run and Debug online from anywhere in world.
Gabriel Staples
www.ElectricRCAircraftGuy.com
20 Aug. 2020
To run locally:
g++ -Wall -Werror -ggdb -std=c++17 -o temp onlinegdb--atomic_block_in_cpp.cpp && ./temp
See also:
1. My "gcc_attribute_cleanup_practice_1" code on onlinegdb: https://www.onlinegdb.com/edit/rJtZoHNb4
2. My Arduino answer here: https://arduino.stackexchange.com/questions/77494/which-arduinos-support-atomic-block/77579#77579.
3. In C++ can constructor and destructor be inline functions?:
https://stackoverflow.com/questions/21303/in-c-can-constructor-and-destructor-be-inline-functions
*******************************************************************************/
#include <stdio.h>
#define ATOMIC_BLOCK(type) for(type; type##_OBJECT_NAME.run(); \
type##_OBJECT_NAME.stop())
#define ATOMIC_FORCEON_OBJECT_NAME atomicBlockForceOn_
#define ATOMIC_FORCEON AtomicBlockForceOn ATOMIC_FORCEON_OBJECT_NAME
class AtomicBlockForceOn
{
public:
// Constructor: called when the object is created
inline AtomicBlockForceOn()
{
printf("noInterrupts()\n"); // turn interrupts OFF
}
// Destructor: called when the object is destroyed (ex: goes
// out-of-scope)
inline ~AtomicBlockForceOn()
{
printf("interrupts()\n"); // turn interrupts ON
}
// Can we run? Returns true to run the `for` loop or
// `false` to stop it.
inline bool run()
{
return run_now;
}
// Tell the `for` loop to stop
inline void stop()
{
run_now = false;
}
private:
bool run_now = true;
};
int main()
{
printf("Hello World\n");
// use it like avrlibc's `ATOMIC_BLOCK() { }` macro:
printf("\nbefore ATOMIC_BLOCK(ATOMIC_FORCEON)\n");
ATOMIC_BLOCK(ATOMIC_FORCEON)
{
printf("after AtomicBlockForceOn constructor\n");
printf("do some stuff here with interrupts off!\n");
} // the `atomicBlockForceOn_` object's destructor is called here
// and interrupts are automatically turned back ON!
printf("after AtomicBlockForceOn destructor\n");
return 0;
}
/*
SAMPLE OUTPUT:
Hello World
before ATOMIC_BLOCK(ATOMIC_FORCEON)
noInterrupts()
after AtomicBlockForceOn constructor
do some stuff here with interrupts off!
interrupts()
after AtomicBlockForceOn destructor
*/
