c - Critical section example - Does it work? -


me , friends came across example code online , arguing wether implements critical section or not.. our opinions going , forth thought asking stackoverflow.

so, implement critical section here or not? 

int flagga[2];   void task0(void){   while(1){   /* code */   flagga[0]=true;   while(flagga[1]==true) /*do nothing*/;   /* critical sektion */   flagga[0]=false;   }  }   void task1(void){   while(1){   /* code */   flagga[1]=true;   while(flagga[0]==true) /*do nothing*/;   /* critical section */   flagga[1]=false;   }  }   void main(void){   flagga[0]=flagga[1]=false;   startthread(task0);   startthread(task1);   while(1);  }

it suffers possible starvation: if neither task gets inner while before other has set flagga true (which can happen if stickily alternate between statements in each task), both stuck in inner while loop.


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