| 0,0 → 1,69 |
|---|
| #include <libsync.h> |
| |
| static int tls_map[128/4]; |
| static int *tls_scan_start = tls_map; |
| static mutex_t tls_mutex; |
| |
| void tls_init() |
| { |
| int i; |
| |
| mutex_init(&tls_mutex); |
| |
| tls_map[0] = 0xE0; |
| |
| for(i = 1; i < 128/4; i++) |
| tls_map[i] = -1; |
| }; |
| |
| int tls_free(unsigned int key) |
| { |
| int retval = -1; |
| |
| if(key < 4096) |
| { |
| mutex_lock(&tls_mutex); |
| |
| __asm__ volatile( |
| "shrl $2, %0 \n\t" |
| "btsl %0, (%1) \n\t" |
| ::"r"(key),"d"(tls_map) |
| :"cc","memory"); |
| tls_scan_start = &tls_map[key>>5]; |
| mutex_unlock(&tls_mutex); |
| retval = 0; |
| } |
| return retval; |
| }; |
| |
| |
| unsigned int tls_alloc() |
| { |
| unsigned int key; |
| |
| mutex_lock(&tls_mutex); |
| |
| __asm__ volatile( |
| "1: \n\t" |
| "bsfl (%1), %0 \n\t" |
| "jnz 2f \n\t" |
| "add $4, %1 \n\t" |
| "cmpl $128+_tls_map, %1 \n\t" |
| "jb 1b \n\t" |
| "xorl %0, %0 \n\t" |
| "notl %0 \n\t" |
| "jmp 3f \n\t" |
| "2: \n\t" |
| "btrl %0, (%1) \n\t" |
| "subl $_tls_map, %1 \n\t" |
| "leal (%0, %1, 8), %%eax \n\t" |
| "shll $2, %0 \n\t" |
| "3:" |
| :"=r"(key),"=d"(tls_scan_start) |
| :"d"(tls_scan_start) |
| :"cc","memory"); |
| |
| mutex_unlock(&tls_mutex); |
| |
| return key; |
| } |