how to use block channel and how to set channel depth

Hi!

When I use 'block channel' to pass data from one kernel to another, my program got stuck, the code post as follow:

//---------------------------------------------------------------------------------------------------------------# define FLIT_MAX_PAYLOAD_LEN 61

typedef unsigned char uint8_t, u8;

typedef struct {

int cnt;

uint8_t payload[FLIT_MAX_PAYLOAD_LEN];

} msg_flit_t;//msg_channel

# pragma OPENCL EXTENSION cl_altera_channels : enable

channel msg_flit_t cnt_out_0 __attribute__((depth(2)));

global int count;

__kernel void producer(){

int i;

int j;

msg_flit_t x;

for(i = 0; i < FLIT_MAX_PAYLOAD_LEN; i++){

x.payload[i] = i;

}

count = 1;

for(j = 0; j < 50; j++){

x.payload[0] += 1;

write_channel_altera(cnt_out_0, x);

}

}

__kernel void cosumer(){

msg_flit_t x;

for(int i = 0; i < 50; i++){

x = read_channel_altera(cnt_out_0);

}

printf("%d\n", x.payload[0]);

}

//---------------------------------------------------------------------------------------------------------------

1> The loop iteration is 50-times, which is > 2(depth of channel), the program got stuck and never come back again, Why?

2> How to set the depth of channel if the producer and cosumer kernel is as follow:

__kernel void producer()

{

.......

while(1) {

write_altera_channel();

}

.......

}

__kernel void consumer()

{

.......

while(1) {

read_altera_channel();

}

.......

}