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/*
* Copyright (C) Max Romanov
* Copyright (C) NGINX, Inc.
*/
#include "nxt_go_process.h"
#include "nxt_go_array.h"
#include "nxt_go_mutex.h"
#include "nxt_go_log.h"
#include "nxt_go_port_memory.h"
#include <nxt_port_memory_int.h>
static nxt_array_t processes; /* of nxt_go_process_t */
static nxt_go_process_t *
nxt_go_find_process(nxt_pid_t pid, uint32_t *pos)
{
uint32_t l, r, i;
nxt_go_process_t *process;
if (nxt_slow_path(processes.size == 0)) {
nxt_go_array_init(&processes, 1, sizeof(nxt_go_process_t));
}
l = 0;
r = processes.nelts;
i = (l + r) / 2;
while (r > l) {
process = nxt_go_array_at(&processes, i);
nxt_go_debug("compare process #%d (%p) at %d",
(int) process->pid, process, (int) i);
if (pid == process->pid) {
nxt_go_debug("found process %d at %d", (int) pid, (int) i);
if (pos != NULL) {
*pos = i;
}
return process;
}
if (pid < process->pid) {
r = i;
} else {
l = i + 1;
}
i = (l + r) / 2;
}
if (pos != NULL) {
*pos = i;
}
nxt_go_debug("process %d not found, best pos %d", (int) pid, (int) i);
return NULL;
}
nxt_go_process_t *
nxt_go_get_process(nxt_pid_t pid)
{
uint32_t pos;
nxt_go_process_t *process;
process = nxt_go_find_process(pid, &pos);
if (process == NULL) {
nxt_go_array_add(&processes);
process = nxt_go_array_at(&processes, pos);
nxt_go_debug("init process #%d (%p) at %d",
(int) pid, process, (int) pos);
if (pos < processes.nelts - 1) {
memmove(process + 1, process,
processes.size * (processes.nelts - 1 - pos));
}
process->pid = pid;
nxt_go_mutex_create(&process->incoming_mutex);
nxt_go_array_init(&process->incoming, 1, sizeof(nxt_go_port_mmap_t));
nxt_go_mutex_create(&process->outgoing_mutex);
nxt_go_array_init(&process->outgoing, 1, sizeof(nxt_go_port_mmap_t));
}
return process;
}
void
nxt_go_new_incoming_mmap(nxt_pid_t pid, nxt_fd_t fd)
{
void *mem;
struct stat mmap_stat;
nxt_go_process_t *process;
nxt_go_port_mmap_t *port_mmap;
process = nxt_go_get_process(pid);
nxt_go_debug("got new mmap fd #%d from process %d",
(int) fd, (int) pid);
if (fstat(fd, &mmap_stat) == -1) {
nxt_go_warn("fstat(%d) failed %d", (int) fd, errno);
return;
}
nxt_go_mutex_lock(&process->incoming_mutex);
port_mmap = nxt_go_array_zero_add(&process->incoming);
if (nxt_slow_path(port_mmap == NULL)) {
nxt_go_warn("failed to add mmap to incoming array");
goto fail;
}
mem = mmap(NULL, mmap_stat.st_size,
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (nxt_slow_path(mem == MAP_FAILED)) {
nxt_go_warn("mmap() failed %d", errno);
goto fail;
}
port_mmap->hdr = mem;
if (nxt_slow_path(port_mmap->hdr->id != process->incoming.nelts - 1)) {
nxt_go_warn("port mmap id mismatch (%d != %d)",
port_mmap->hdr->id, process->incoming.nelts - 1);
}
port_mmap->hdr->sent_over = 0xFFFFu;
fail:
nxt_go_mutex_unlock(&process->incoming_mutex);
}
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