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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_process.h>
#include <ngx_log.h>
#include <ngx_alloc.h>
extern int __isthreaded;
typedef int ngx_tid_t;
#define NGX_MAX_THREADS 10
static inline int ngx_gettid();
static char *stacks_start;
static char *stacks_end;
static size_t stack_size;
static char *last_stack;
static int last_thread;
static ngx_log_t *log;
static ngx_tid_t tids[NGX_MAX_THREADS];
static int red_zone = 4096;
/* the thread-safe errno */
static int errnos[NGX_MAX_THREADS];
int *__error()
{
return &errnos[ngx_gettid()];
}
int ngx_create_thread(ngx_tid_t *tid, int (*func)(void *arg), void *arg)
{
int id, err;
char *stack_top;
last_stack += stack_size;
stack_top = last_stack - red_zone;
if (stack_top > stacks_end) {
ngx_log_error(NGX_LOG_CRIT, log, 0, "no more threads allocated");
return NGX_ERROR;
}
#if 0
id = rfork(RFFDG|RFCFDG);
#elif 0
id = rfork_thread(RFFDG|RFCFDG, stack_top, func, arg);
#elif 0
id = rfork_thread(RFPROC|RFMEM, stack_top, func, arg);
#else
id = rfork_thread(RFPROC|RFTHREAD|RFMEM, stack_top, func, arg);
#endif
err = errno;
if (id == -1) {
ngx_log_error(NGX_LOG_ALERT, log, err, "rfork() failed");
} else {
*tid = id;
tids[last_thread++] = id;
/* allow the spinlock in libc malloc() */
__isthreaded = 1;
}
return err;
}
int ngx_init_thread_env(int n, size_t size, ngx_log_t *lg)
{
int len, i;
char *usrstack, *zone;
log = lg;
/* create the thread stacks */
len = 4;
if (sysctlbyname("kern.usrstack", &usrstack, &len, NULL, 0) == -1) {
ngx_log_error(NGX_LOG_ALERT, log, errno,
"sysctlbyname(kern.usrstack) failed");
return NGX_ERROR;
}
printf("usrstack: %08X\n", usrstack);
printf("red zone: %08X\n", usrstack - (size + red_zone));
#if 1
/* red zone */
zone = mmap(usrstack - (size + red_zone), red_zone,
PROT_NONE, MAP_ANON, -1, 0);
if (zone == MAP_FAILED) {
ngx_log_error(NGX_LOG_ALERT, log, errno,
"mmap(%d, PROT_NONE, MAP_ANON) failed", red_zone);
return NGX_ERROR;
}
#else
zone = usrstack - (size + red_zone);
#endif
last_stack = zone + red_zone;
for (i = 0; i < n; i++) {
last_stack -= size + red_zone;
printf("stack: %08X\n", last_stack);
last_stack = mmap(last_stack, size, PROT_READ|PROT_WRITE,
MAP_STACK, -1, 0);
if (last_stack == MAP_FAILED) {
ngx_log_error(NGX_LOG_ALERT, log, errno,
"mmap(%d, MAP_STACK) failed", size);
return NGX_ERROR;
}
}
stacks_start = last_stack;
stack_size = size + red_zone;
stacks_end = stacks_start + n * stack_size;
tids[0] = ngx_getpid();
last_thread = 1;
return NGX_OK;
}
ngx_tid_t ngx_thread_self()
{
return tids[ngx_gettid()];
}
static inline int ngx_gettid()
{
char *sp;
__asm__ ("mov %%esp, %0" : "=q" (sp));
return (sp > stacks_end) ? 0 : ((sp - stacks_start) / stack_size + 1);
}
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