On 07/05/2010 09:59 PM, zhou tianjun wrote:
I'm in doubt of the means of setflag()'s parameter. I have looked for it everywhere including internet and the ser source code, but no any docs explained it in detail. can anybody tell me about it ?
It sets bits in a 32-bit integer (it may be 64-bit on 64-bit platforms, of this I am not sure) that is bound to a transaction, so those "flags" may be accessed in requests and replies associated with a given transaction, or, further down in the execution flow of same message handler.
It is precisely equivalent to the way bit vectors are used in general-purpose programming languages, e.g.
int flags = 0;
flags |= (1 << 4); /* Set bit 4 */
if(flags & (1 << 4)) { printf("Bit 4 is set!\n"); } else { printf("Bit 4 is not set!\n"); }
/* If bit 4 is set, unset it */
if(flags & (1 << 4)) flags &= ~(1 << 4);