Interested to Buy Any Domain ? << Click Here >> for more details...
Can we use semaphore or mutex or spin lock in interrupt
context in linux kernel ?
- 3 Answers
- 20526 Views
- Broadcom, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / achilles
We cannot sleep in interrupt context so semaphores and mutex
can't be used.
Spinlocks can be used for locking in interrupt context.
| Is This Answer Correct ? | 31 Yes | 6 No |
Answer / jagannath
spinlock with irq saved is the best choice in interrupt
handler.
| Is This Answer Correct ? | 5 Yes | 2 No |
What is the scope of a function that is declared as static?
A=7; b=8; x=a++-b; printf(“%d”, x ); what does this code give as output?
Tell me what are the different types of customizations that is used with the “volatile” keyword?
Mention how I/O devices are classified for embedded system?
Infinite loops often arise in embedded systems. How does you code an infinite loop in c?
Explain what is the difference between mutexes and semaphores?
What is kernel paging?
This program is in verilog and need help to get it working correctly. This is the code i have so far. Please help. Simple testbench would be great. Thanks\ 'define vend_a_drink {D,dispense,collect} = {IDLE,2'b11}; module drink_machine(nickel_in, dime_in, quarter_in, collect, nickel_out, dime_out, dispense, reset, clk) ; parameter IDLE=0,FIVE=1,TEN=2,TWENTY_FIVE=3, FIFTEEN=4,THIRTY=5,TWENTY=6,OWE_DIME=7; input nickel_in, dime_in, quarter_in, reset, clk; output collect, nickel_out, dime_out, dispense; reg collect, nickel_out, dime_out, dispense; reg [2:0] D, Q; /* state */ // synopsys state_vector Q always @ ( nickel_in or dime_in or quarter_in or reset ) begin nickel_out = 0; dime_out = 0; dispense = 0; collect = 0; if ( reset ) D = IDLE; else begin D = Q; case ( Q ) IDLE: if (nickel_in) D = FIVE; else if (dime_in) D = TEN; else if (quarter_in) D = TWENTY_FIVE; FIVE: if(nickel_in) D = TEN; else if (dime_in) D = FIFTEEN; else if (quarter_in) D = THIRTY; TEN: if (nickel_in) D = FIFTEEN; else if (dime_in) D = TWENTY; else if (quarter_in) 'vend_a_drink; TWENTY_FIVE: if( nickel_in) D = THIRTY; else if (dime_in) 'vend_a_drink; else if (quarter_in) begin 'vend_a_drink; nickel_out = 1; dime_out = 1; end FIFTEEN: if (nickel_in) D = TWENTY; else if (dime_in) D = TWENTY_FIVE; else if (quarter_in) begin 'vend_a_drink; nickel_out = 1; end THIRTY: if (nickel_in) 'vend_a_drink; else if (dime_in) begin 'vend_a_drink; nickel_out = 1; end else if (quarter_in) begin 'vend_a_drink; dime_out = 1; D = OWE_DIME; end TWENTY: if (nickel_in) D = TWENTY_FIVE; else if (dime_in) D = THIRTY; else if (quarter_in) begin 'vend_a_drink; dime_out = 1; end OWE_DIME: begin dime_out = 1; D = IDLE; end endcase end end always @ (posedge clk ) begin Q = D; end endmodule
Significance of watchdog timer in embedded systems.
If a system goes blank, how do you debug it?
Tell me what is the difference between hardware design and software design?
Who are the gang of four? Why should you care?
86 Family 
