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Fixing shared memory thread safety issue.

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Do not reuse shared memory segment with different port until this segment
successfully received and indexed on other side. However, segment can be used
to transfer data via the port it was sent at any time.
This commit is contained in:
Max Romanov
2017-09-18 17:35:24 +03:00
parent 75a6325656
commit 4f7e00ef34
4 changed files with 13 additions and 2 deletions
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7
src/nxt_port_memory.c
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@@ -198,6 +198,8 @@ nxt_port_incoming_port_mmap(nxt_task_t *task, nxt_process_t *process,
nxt_abort();
}
hdr->sent_over = 0xFFFFu;
fail:
nxt_thread_mutex_unlock(&process->incoming_mutex);
@@ -297,6 +299,7 @@ nxt_port_new_port_mmap(nxt_task_t *task, nxt_process_t *process,
hdr->id = process->outgoing->nelts - 1;
hdr->pid = process->pid;
hdr->sent_over = port->id;
/* Mark first chunk as busy */
nxt_port_mmap_set_chunk_busy(hdr, 0);
@@ -356,7 +359,9 @@ nxt_port_mmap_get(nxt_task_t *task, nxt_port_t *port, nxt_chunk_id_t *c,
while (port_mmap < end_port_mmap) {
if (nxt_port_mmap_get_free_chunk(port_mmap->hdr, c)) {
if ( (port_mmap->hdr->sent_over == 0xFFFFu ||
port_mmap->hdr->sent_over == port->id) &&
nxt_port_mmap_get_free_chunk(port_mmap->hdr, c)) {
hdr = port_mmap->hdr;
goto unlock_return;