static unsigned long
virNodeCountThreadSiblings(const char *dir, unsigned int cpu)
{
unsigned long ret = 0;
char *path;
FILE *pathfp;
char str[1024];
size_t i;
if (virAsprintf(&path, "%s/cpu%u/topology/thread_siblings",
dir, cpu) < 0)
return 0;
pathfp = fopen(path, "r");
if (pathfp == NULL) {
/* If file doesn't exist, then pretend our only
* sibling is ourself */
if (errno == ENOENT) {
VIR_FREE(path);
return 1;
}
virReportSystemError(errno, _("cannot open %s"), path);
VIR_FREE(path);
return 0;
}
if (fgets(str, sizeof(str), pathfp) == NULL) {
virReportSystemError(errno, _("cannot read from %s"), path);
goto cleanup;
}
i = 0;
while (str[i] != '\0') {
if (c_isdigit(str[i]))
ret += count_one_bits(str[i] - '0');
else if (str[i] >= 'A' && str[i] <= 'F')
ret += count_one_bits(str[i] - 'A' + 10);
else if (str[i] >= 'a' && str[i] <= 'f')
ret += count_one_bits(str[i] - 'a' + 10);
i++;
}
cleanup:
VIR_FORCE_FCLOSE(pathfp);
VIR_FREE(path);
return ret;
}
static unsigned long
virHostCPUCountThreadSiblings(const char *dir, unsigned int cpu)
{
unsigned long ret = 0;
char *path;
char *str = NULL;
size_t i;
if (virAsprintf(&path, "%s/cpu%u/topology/thread_siblings",
dir, cpu) < 0)
return 0;
if (!virFileExists(path)) {
/* If file doesn't exist, then pretend our only
* sibling is ourself */
ret = 1;
goto cleanup;
}
if (virFileReadAll(path, SYSFS_THREAD_SIBLINGS_LIST_LENGTH_MAX, &str) < 0)
goto cleanup;
for (i = 0; str[i] != '\0'; i++) {
if (c_isxdigit(str[i]))
ret += count_one_bits(virHexToBin(str[i]));
}
cleanup:
VIR_FREE(str);
VIR_FREE(path);
return ret;
}
/***********************************************************
* Function: // main
* Description: // 主函数
***********************************************************/
int main( void )
{
unsigned int v = 0xAA;
printf( "0x%X one bits count is:%d. \n", v, count_one_bits( v ) );
return 0;
}
size_t traverse(cow_trie_p map) {
size_t count = 0;
count += map->size;
for (int i=0;i<count_one_bits(map->child_bitmap);i++) {
count += traverse(cow_trie_children(map)[i]);
}
return count;
}
static unsigned long count_thread_siblings(unsigned int cpu)
{
unsigned long ret = 0;
char *path;
FILE *pathfp;
char str[1024];
int i;
if (virAsprintf(&path, "%s/cpu%u/topology/thread_siblings",
sysfs_path, cpu) < 0) {
virReportOOMError();
return 0;
}
pathfp = fopen(path, "r");
if (pathfp == NULL) {
virReportSystemError(errno, _("cannot open %s"), path);
VIR_FREE(path);
return 0;
}
if (fgets(str, sizeof(str), pathfp) == NULL) {
virReportSystemError(errno, _("cannot read from %s"), path);
goto cleanup;
}
i = 0;
while (str[i] != '\0') {
if (c_isdigit(str[i]))
ret += count_one_bits(str[i] - '0');
else if (str[i] >= 'A' && str[i] <= 'F')
ret += count_one_bits(str[i] - 'A' + 10);
else if (str[i] >= 'a' && str[i] <= 'f')
ret += count_one_bits(str[i] - 'a' + 10);
i++;
}
cleanup:
VIR_FORCE_FCLOSE(pathfp);
VIR_FREE(path);
return ret;
}
void
channel_mask_splits(struct i_array *counts,
unsigned int channel_count,
unsigned int channel_mask) {
/*Although the WAVEFORMATEXTENSIBLE channel mask
supports more left/right channels than these,
everything beyond side-left/side-right
is stored with a center channel in-between
which means we can't pull them apart in pairs.*/
unsigned int masks[] = {0x3, 0x1, 0x2, /*fLfR, fL, fR*/
0x4, 0x8, /*fC, LFE*/
0x30, 0x10, 0x20, /*bLbR, bL, bR*/
0xC0, 0x40, 0x80, /*fLoC, fRoC, fLoC, fRoC*/
0x100, /*bC*/
0x600, 0x200, 0x400, /*sLsR, sL, sR*/
0};
unsigned int channels;
int i;
assert(channel_count > 0);
/*first, try to pull left/right channels out of the mask*/
for (i = 0; channel_mask && masks[i]; i++) {
if (channel_mask & masks[i]) {
channels = count_one_bits(masks[i]);
ia_append(counts, channels);
channel_count -= channels;
channel_mask ^= masks[i];
}
}
/*any leftover channels are sent out in separate blocks
(which may happen with a mask of 0)*/
for (; channel_count > 0; channel_count--) {
ia_append(counts, 1);
}
}