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