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Add initial multithreading support and example

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This is the basic support for doing i/o in a separate worker thread.
It is still not threads safe but a start.
Now we need to protect all variables such as outqueue, waitpdu
and friends.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
This commit is contained in:
Ronnie Sahlberg
2025-03-25 12:42:31 +10:00
parent cb44ad4e26
commit 3c48aea225
10 changed files with 492 additions and 95 deletions
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18
include/iscsi-private.h
View File

@@ -37,21 +37,14 @@
atomic_fetch_sub_explicit(&x, 1, memory_order_relaxed)
#else /* HAVE_STDATOMIC_H */
#define ATOMIC_INC(rpc, x) \
if (rpc->multithreading_enabled) { \
nfs_mt_mutex_lock(&rpc->atomic_int_mutex); \
iscs_mt_mutex_lock(&iscs->atomic_int_mutex); \
} \
x++; \
if (rpc->multithreading_enabled) { \
nfs_mt_mutex_unlock(&rpc->atomic_int_mutex); \
}
iscsi_mt_mutex_unlock(&iscsi->atomic_int_mutex);
#define ATOMIC_DEC(rpc, x) \
if (rpc->multithreading_enabled) { \
nfs_mt_mutex_lock(&rpc->atomic_int_mutex); \
} \
nfs_mt_mutex_lock(&rpc->atomic_int_mutex); \
x--; \
if (rpc->multithreading_enabled) { \
nfs_mt_mutex_unlock(&rpc->atomic_int_mutex); \
}
nfs_mt_mutex_unlock(&rpc->atomic_int_mutex);
#endif /* HAVE_STDATOMIC_H */
#else /* HAVE_MULTITHREADING */
/* no multithreading support, no need to protect the increment */
@@ -223,9 +216,6 @@ struct iscsi_context {
libiscsi_mutex_t iscsi_mutex;
libiscsi_thread_t service_thread;
int poll_timeout;
//libnfs_mutex_t nfs4_open_counter_mutex;
//libnfs_mutex_t nfs4_open_call_mutex;
//struct nfs_thread_context *thread_ctx;
#ifndef HAVE_STDATOMIC_H
libiscsi_mutex_t atomic_int_mutex;
#endif /* HAVE_STDATOMIC_H */

12
include/iscsi.h
View File

@@ -1702,6 +1702,18 @@ iscsi_set_fd_dup_cb(struct iscsi_context *iscsi,
void (*cb)(struct iscsi_context *iscsi, void *opaque),
void *opaque);
/*
* MULTITHREADING
*/
/*
* This function starts a separate service thread for multithreading support.
*/
EXTERN int iscsi_mt_service_thread_start(struct iscsi_context *iscsi);
/*
* Shutdown multithreading support.
*/
EXTERN void iscsi_mt_service_thread_stop(struct iscsi_context *iscsi);
#ifdef __cplusplus
}
#endif