xref: /unit/src/nxt_port_memory_int.h (revision 363)
180Smax.romanov@nginx.com 
280Smax.romanov@nginx.com /*
380Smax.romanov@nginx.com  * Copyright (C) Max Romanov
480Smax.romanov@nginx.com  * Copyright (C) NGINX, Inc.
580Smax.romanov@nginx.com  */
680Smax.romanov@nginx.com 
780Smax.romanov@nginx.com #ifndef _NXT_PORT_MEMORY_INT_H_INCLUDED_
880Smax.romanov@nginx.com #define _NXT_PORT_MEMORY_INT_H_INCLUDED_
980Smax.romanov@nginx.com 
1080Smax.romanov@nginx.com 
1180Smax.romanov@nginx.com #include <stdint.h>
1280Smax.romanov@nginx.com #include <nxt_atomic.h>
1380Smax.romanov@nginx.com 
1480Smax.romanov@nginx.com 
1580Smax.romanov@nginx.com #ifdef NXT_MMAP_TINY_CHUNK
1680Smax.romanov@nginx.com 
1780Smax.romanov@nginx.com #define PORT_MMAP_CHUNK_SIZE    16
1880Smax.romanov@nginx.com #define PORT_MMAP_HEADER_SIZE   1024
1980Smax.romanov@nginx.com #define PORT_MMAP_DATA_SIZE     1024
2080Smax.romanov@nginx.com 
2180Smax.romanov@nginx.com #else
2280Smax.romanov@nginx.com 
2380Smax.romanov@nginx.com #define PORT_MMAP_CHUNK_SIZE    (1024 * 16)
2480Smax.romanov@nginx.com #define PORT_MMAP_HEADER_SIZE   (1024 * 4)
2580Smax.romanov@nginx.com #define PORT_MMAP_DATA_SIZE     (1024 * 1024 * 10)
2680Smax.romanov@nginx.com 
2780Smax.romanov@nginx.com #endif
2880Smax.romanov@nginx.com 
2980Smax.romanov@nginx.com 
3080Smax.romanov@nginx.com #define PORT_MMAP_SIZE          (PORT_MMAP_HEADER_SIZE + PORT_MMAP_DATA_SIZE)
3180Smax.romanov@nginx.com #define PORT_MMAP_CHUNK_COUNT   (PORT_MMAP_DATA_SIZE / PORT_MMAP_CHUNK_SIZE)
3280Smax.romanov@nginx.com 
3380Smax.romanov@nginx.com 
3480Smax.romanov@nginx.com typedef uint32_t  nxt_chunk_id_t;
3580Smax.romanov@nginx.com 
3680Smax.romanov@nginx.com typedef nxt_atomic_uint_t  nxt_free_map_t;
3780Smax.romanov@nginx.com 
3880Smax.romanov@nginx.com #define FREE_BITS (sizeof(nxt_free_map_t) * 8)
3980Smax.romanov@nginx.com 
4080Smax.romanov@nginx.com #define FREE_IDX(nchunk) ((nchunk) / FREE_BITS)
4180Smax.romanov@nginx.com 
4280Smax.romanov@nginx.com #define FREE_MASK(nchunk)                                                     \
4380Smax.romanov@nginx.com     ( 1ULL << ( (nchunk) % FREE_BITS ) )
4480Smax.romanov@nginx.com 
4580Smax.romanov@nginx.com #define MAX_FREE_IDX FREE_IDX(PORT_MMAP_CHUNK_COUNT)
4680Smax.romanov@nginx.com 
4780Smax.romanov@nginx.com 
4880Smax.romanov@nginx.com /* Mapped at the start of shared memory segment. */
4980Smax.romanov@nginx.com struct nxt_port_mmap_header_s {
5080Smax.romanov@nginx.com     uint32_t        id;
51*363Smax.romanov@nginx.com     nxt_pid_t       src_pid; /* For sanity check. */
52*363Smax.romanov@nginx.com     nxt_pid_t       dst_pid; /* For sanity check. */
53323Smax.romanov@nginx.com     nxt_port_id_t   sent_over;
5480Smax.romanov@nginx.com     nxt_free_map_t  free_map[MAX_FREE_IDX];
5580Smax.romanov@nginx.com };
5680Smax.romanov@nginx.com 
5780Smax.romanov@nginx.com 
5880Smax.romanov@nginx.com /*
5980Smax.romanov@nginx.com  * Element of nxt_process_t.incoming/outgoing, shared memory segment
6080Smax.romanov@nginx.com  * descriptor.
6180Smax.romanov@nginx.com  */
6280Smax.romanov@nginx.com struct nxt_port_mmap_s {
6380Smax.romanov@nginx.com     nxt_port_mmap_header_t  *hdr;
6480Smax.romanov@nginx.com };
6580Smax.romanov@nginx.com 
6680Smax.romanov@nginx.com typedef struct nxt_port_mmap_msg_s nxt_port_mmap_msg_t;
6780Smax.romanov@nginx.com 
6880Smax.romanov@nginx.com /* Passed as a second iov chunk when 'mmap' bit in nxt_port_msg_t is 1. */
6980Smax.romanov@nginx.com struct nxt_port_mmap_msg_s {
7080Smax.romanov@nginx.com     uint32_t            mmap_id;    /* Mmap index in nxt_process_t.outgoing. */
7180Smax.romanov@nginx.com     nxt_chunk_id_t      chunk_id;   /* Mmap chunk index. */
7280Smax.romanov@nginx.com     uint32_t            size;       /* Payload data size. */
7380Smax.romanov@nginx.com };
7480Smax.romanov@nginx.com 
7580Smax.romanov@nginx.com 
7680Smax.romanov@nginx.com static nxt_bool_t
7780Smax.romanov@nginx.com nxt_port_mmap_get_free_chunk(nxt_port_mmap_header_t *hdr, nxt_chunk_id_t *c);
7880Smax.romanov@nginx.com 
7980Smax.romanov@nginx.com #define nxt_port_mmap_get_chunk_busy(hdr, c)                                  \
8080Smax.romanov@nginx.com     ((hdr->free_map[FREE_IDX(c)] & FREE_MASK(c)) == 0)
8180Smax.romanov@nginx.com 
8280Smax.romanov@nginx.com nxt_inline void
8380Smax.romanov@nginx.com nxt_port_mmap_set_chunk_busy(nxt_port_mmap_header_t *hdr, nxt_chunk_id_t c);
8480Smax.romanov@nginx.com 
8580Smax.romanov@nginx.com nxt_inline nxt_bool_t
8680Smax.romanov@nginx.com nxt_port_mmap_chk_set_chunk_busy(nxt_port_mmap_header_t *hdr, nxt_chunk_id_t c);
8780Smax.romanov@nginx.com 
8880Smax.romanov@nginx.com nxt_inline void
8980Smax.romanov@nginx.com nxt_port_mmap_set_chunk_free(nxt_port_mmap_header_t *hdr, nxt_chunk_id_t c);
9080Smax.romanov@nginx.com 
9180Smax.romanov@nginx.com nxt_inline nxt_chunk_id_t
9280Smax.romanov@nginx.com nxt_port_mmap_chunk_id(nxt_port_mmap_header_t *hdr, u_char *p)
9380Smax.romanov@nginx.com {
9480Smax.romanov@nginx.com     u_char  *mm_start;
9580Smax.romanov@nginx.com 
9680Smax.romanov@nginx.com     mm_start = (u_char *) hdr;
9780Smax.romanov@nginx.com 
9880Smax.romanov@nginx.com     return ((p - mm_start) - PORT_MMAP_HEADER_SIZE) / PORT_MMAP_CHUNK_SIZE;
9980Smax.romanov@nginx.com }
10080Smax.romanov@nginx.com 
10180Smax.romanov@nginx.com 
10280Smax.romanov@nginx.com nxt_inline u_char *
10380Smax.romanov@nginx.com nxt_port_mmap_chunk_start(nxt_port_mmap_header_t *hdr, nxt_chunk_id_t c)
10480Smax.romanov@nginx.com {
10580Smax.romanov@nginx.com     u_char  *mm_start;
10680Smax.romanov@nginx.com 
10780Smax.romanov@nginx.com     mm_start = (u_char *) hdr;
10880Smax.romanov@nginx.com 
10980Smax.romanov@nginx.com     return mm_start + PORT_MMAP_HEADER_SIZE + c * PORT_MMAP_CHUNK_SIZE;
11080Smax.romanov@nginx.com }
11180Smax.romanov@nginx.com 
11280Smax.romanov@nginx.com 
11380Smax.romanov@nginx.com static nxt_bool_t
11480Smax.romanov@nginx.com nxt_port_mmap_get_free_chunk(nxt_port_mmap_header_t *hdr, nxt_chunk_id_t *c)
11580Smax.romanov@nginx.com {
11680Smax.romanov@nginx.com     int             ffs;
11780Smax.romanov@nginx.com     size_t          i;
11880Smax.romanov@nginx.com     nxt_chunk_id_t  chunk;
11980Smax.romanov@nginx.com     nxt_free_map_t  bits;
12080Smax.romanov@nginx.com     nxt_free_map_t  *free_map;
12180Smax.romanov@nginx.com 
12280Smax.romanov@nginx.com     free_map = hdr->free_map;
12380Smax.romanov@nginx.com 
12480Smax.romanov@nginx.com     for (i = 0; i < MAX_FREE_IDX; i++) {
12580Smax.romanov@nginx.com         bits = free_map[i];
12680Smax.romanov@nginx.com         if (bits == 0) {
12780Smax.romanov@nginx.com             continue;
12880Smax.romanov@nginx.com         }
12980Smax.romanov@nginx.com 
13080Smax.romanov@nginx.com         ffs = __builtin_ffsll(bits);
13180Smax.romanov@nginx.com         if (ffs != 0) {
13280Smax.romanov@nginx.com             chunk = i * FREE_BITS + ffs - 1;
13380Smax.romanov@nginx.com 
13480Smax.romanov@nginx.com             if (nxt_port_mmap_chk_set_chunk_busy(hdr, chunk)) {
13580Smax.romanov@nginx.com                 *c = chunk;
13680Smax.romanov@nginx.com                 return 1;
13780Smax.romanov@nginx.com             }
13880Smax.romanov@nginx.com         }
13980Smax.romanov@nginx.com     }
14080Smax.romanov@nginx.com 
14180Smax.romanov@nginx.com     return 0;
14280Smax.romanov@nginx.com }
14380Smax.romanov@nginx.com 
14480Smax.romanov@nginx.com 
14580Smax.romanov@nginx.com nxt_inline void
14680Smax.romanov@nginx.com nxt_port_mmap_set_chunk_busy(nxt_port_mmap_header_t *hdr, nxt_chunk_id_t c)
14780Smax.romanov@nginx.com {
14880Smax.romanov@nginx.com     nxt_atomic_and_fetch(hdr->free_map + FREE_IDX(c), ~FREE_MASK(c));
14980Smax.romanov@nginx.com }
15080Smax.romanov@nginx.com 
15180Smax.romanov@nginx.com 
15280Smax.romanov@nginx.com nxt_inline nxt_bool_t
15380Smax.romanov@nginx.com nxt_port_mmap_chk_set_chunk_busy(nxt_port_mmap_header_t *hdr, nxt_chunk_id_t c)
15480Smax.romanov@nginx.com {
15580Smax.romanov@nginx.com     nxt_free_map_t  *f;
15680Smax.romanov@nginx.com     nxt_free_map_t  free_val, busy_val;
15780Smax.romanov@nginx.com 
15880Smax.romanov@nginx.com     f = hdr->free_map + FREE_IDX(c);
15980Smax.romanov@nginx.com 
16080Smax.romanov@nginx.com     while ( (*f & FREE_MASK(c)) != 0 ) {
16180Smax.romanov@nginx.com 
16280Smax.romanov@nginx.com         free_val = *f | FREE_MASK(c);
16380Smax.romanov@nginx.com         busy_val = free_val & ~FREE_MASK(c);
16480Smax.romanov@nginx.com 
16580Smax.romanov@nginx.com         if (nxt_atomic_cmp_set(f, free_val, busy_val) != 0) {
16680Smax.romanov@nginx.com             return 1;
16780Smax.romanov@nginx.com         }
16880Smax.romanov@nginx.com     }
16980Smax.romanov@nginx.com 
17080Smax.romanov@nginx.com     return 0;
17180Smax.romanov@nginx.com }
17280Smax.romanov@nginx.com 
17380Smax.romanov@nginx.com 
17480Smax.romanov@nginx.com nxt_inline void
17580Smax.romanov@nginx.com nxt_port_mmap_set_chunk_free(nxt_port_mmap_header_t *hdr, nxt_chunk_id_t c)
17680Smax.romanov@nginx.com {
17780Smax.romanov@nginx.com     nxt_atomic_or_fetch(hdr->free_map + FREE_IDX(c), FREE_MASK(c));
17880Smax.romanov@nginx.com }
17980Smax.romanov@nginx.com 
18080Smax.romanov@nginx.com 
18180Smax.romanov@nginx.com #endif /* _NXT_PORT_MEMORY_INT_H_INCLUDED_ */
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