Add FreeBSD AIO support.

dbms/src/IO/AIO.cpp

@@ -53,4 +53,91 @@ AIOContext::~AIOContext()
     io_destroy(ctx);
 }
 
+#elif defined(__FreeBSD__)
+
+#include <boost/noncopyable.hpp>
+#include <Common/Exception.h>
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/time.h>
+#include <aio.h>
+
+#include <IO/AIO.h>
+
+
+/** Small wrappers for asynchronous I/O.
+  */
+
+namespace DB
+{
+    namespace ErrorCodes
+    {
+        extern const int CANNOT_IOSETUP;
+    }
+}
+
+
+int io_setup(void)
+{
+    return kqueue();
+}
+
+int io_destroy(int ctx)
+{
+    return close(ctx);
+}
+
+int io_submit(int ctx, long nr, struct iocb * iocbpp[])
+{
+    long i;
+    int r;
+    struct sigevent *se;
+    struct aiocb *iocb;
+
+    for (i = 0; i < nr; i ++) {
+	iocb = &iocbpp[i]->aio;
+
+	se = &iocb->aio_sigevent;
+	se->sigev_notify_kqueue = ctx;
+	se->sigev_notify_kevent_flags = 0;
+	se->sigev_notify = SIGEV_KEVENT;
+	se->sigev_value.sival_ptr = iocbpp[i];
+
+	switch(iocb->aio_lio_opcode) {
+	    case LIO_READ:
+		r = aio_read(iocb);
+		break;
+	    case LIO_WRITE:
+		r = aio_write(iocb);
+		break;
+	    default: break;
+	}
+	if (r < 0) {
+	    return r;
+	}
+    }
+
+    return i;
+}
+
+int io_getevents(int ctx, long min_nr, long max_nr, struct kevent * events, struct timespec * timeout)
+{
+    min_nr = 0;
+    return kevent(ctx, NULL, 0, events, max_nr, timeout);
+}
+
+
+AIOContext::AIOContext(unsigned int nr_events)
+{
+    nr_events = 0;
+    ctx = io_setup();
+    if (ctx < 0)
+        DB::throwFromErrno("io_setup failed", DB::ErrorCodes::CANNOT_IOSETUP);
+}
+
+AIOContext::~AIOContext()
+{
+    io_destroy(ctx);
+}
+
 #endif

dbms/src/IO/AIO.h

@@ -39,4 +39,38 @@ struct AIOContext : private boost::noncopyable
     ~AIOContext();
 };
 
+#elif defined(__FreeBSD__)
+
+#include <boost/noncopyable.hpp>
+#include <aio.h>
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/time.h>
+
+typedef struct kevent io_event;
+typedef int aio_context_t;
+
+struct iocb {
+    struct aiocb aio;
+    long aio_data;
+};
+
+int io_setup(void);
+
+int io_destroy(void);
+
+/// last argument is an array of pointers technically speaking
+int io_submit(int ctx, long nr, struct iocb * iocbpp[]);
+
+int io_getevents(int ctx, long min_nr, long max_nr, struct kevent * events, struct timespec * timeout);
+
+
+struct AIOContext : private boost::noncopyable
+{
+    int ctx;
+
+    AIOContext(unsigned int nr_events = 128);
+    ~AIOContext();
+};
+
 #endif

dbms/src/IO/AIOContextPool.cpp

@@ -1,4 +1,4 @@
-#if defined(__linux__)
+#if defined(__linux__) || defined(__FreeBSD__)
 
 #include <Common/Exception.h>
 #include <common/logger_useful.h>
@@ -94,7 +94,11 @@ void AIOContextPool::fulfillPromises(const io_event events[], const int num_even
             continue;
         }
 
+#if defined(__FreeBSD__)
+        it->second.set_value(aio_return((struct aiocb *)event.udata));
+#else
         it->second.set_value(event.res);
+#endif
         promises.erase(it);
     }
 }

dbms/src/IO/AIOContextPool.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#if defined(__linux__)
+#if defined(__linux__) || defined(__FreeBSD__)
 
 #include <ext/singleton.h>
 #include <condition_variable>

dbms/src/IO/ReadBufferAIO.cpp

@@ -1,4 +1,4 @@
-#if defined(__linux__)
+#if defined(__linux__) || defined(__FreeBSD__)
 
 #include <IO/ReadBufferAIO.h>
 #include <IO/AIOContextPool.h>
@@ -120,11 +120,16 @@ bool ReadBufferAIO::nextImpl()
     /// Create an asynchronous request.
     prepare();
 
+#if defined(__FreeBSD__)
+    request.aio.aio_lio_opcode = LIO_READ;
+    request.aio.aio_buf = reinterpret_cast<volatile void *>(buffer_begin);
+#else
     request.aio_lio_opcode = IOCB_CMD_PREAD;
-    request.aio_fildes = fd;
     request.aio_buf = reinterpret_cast<UInt64>(buffer_begin);
-    request.aio_nbytes = region_aligned_size;
+#endif
-    request.aio_offset = region_aligned_begin;
+    request.aio.aio_fildes = fd;
+    request.aio.aio_nbytes = region_aligned_size;
+    request.aio.aio_offset = region_aligned_begin;
 
     /// Send the request.
     try

dbms/src/IO/ReadBufferAIO.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#if defined(__linux__)
+#if defined(__linux__) || defined(__FreeBSD__)
 
 #include <IO/ReadBufferFromFileBase.h>
 #include <IO/ReadBuffer.h>

dbms/src/IO/WriteBufferAIO.cpp

@@ -1,4 +1,4 @@
-#if defined(__linux__)
+#if defined(__linux__) || defined(__FreeBSD__)
 
 #include <IO/WriteBufferAIO.h>
 #include <Common/ProfileEvents.h>
@@ -110,11 +110,16 @@ void WriteBufferAIO::nextImpl()
     /// Create a request for asynchronous write.
     prepare();
 
+#if defined(__FreeBSD__)
+    request.aio.aio_lio_opcode = LIO_WRITE;
+    request.aio.aio_buf = reinterpret_cast<volatile void *>(buffer_begin);
+#else
     request.aio_lio_opcode = IOCB_CMD_PWRITE;
-    request.aio_fildes = fd;
     request.aio_buf = reinterpret_cast<UInt64>(buffer_begin);
-    request.aio_nbytes = region_aligned_size;
+#endif
-    request.aio_offset = region_aligned_begin;
+    request.aio.aio_fildes = fd;
+    request.aio.aio_nbytes = region_aligned_size;
+    request.aio.aio_offset = region_aligned_begin;
 
     /// Send the request.
     while (io_submit(aio_context.ctx, 1, &request_ptr) < 0)
@@ -193,7 +198,11 @@ bool WriteBufferAIO::waitForAIOCompletion()
     }
 
     is_pending_write = false;
+#if defined(__FreeBSD__)
+    bytes_written = aio_return((struct aiocb *)event.udata);
+#else
     bytes_written = event.res;
+#endif
 
     ProfileEvents::increment(ProfileEvents::WriteBufferAIOWrite);
     ProfileEvents::increment(ProfileEvents::WriteBufferAIOWriteBytes, bytes_written);
@@ -396,7 +405,7 @@ void WriteBufferAIO::finalize()
 
     bytes_written -= truncation_count;
 
-    off_t pos_offset = bytes_written - (pos_in_file - request.aio_offset);
+    off_t pos_offset = bytes_written - (pos_in_file - request.aio.aio_offset);
     if (pos_in_file > (std::numeric_limits<off_t>::max() - pos_offset))
         throw Exception("An overflow occurred during file operation", ErrorCodes::LOGICAL_ERROR);
     pos_in_file += pos_offset;

dbms/src/IO/WriteBufferAIO.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#if defined(__linux__)
+#if defined(__linux__) || defined(__FreeBSD__)
 
 #include <IO/WriteBufferFromFileBase.h>
 #include <IO/WriteBuffer.h>

dbms/src/IO/createReadBufferFromFileBase.cpp

@@ -1,6 +1,6 @@
 #include <IO/createReadBufferFromFileBase.h>
 #include <IO/ReadBufferFromFile.h>
-#if defined(__linux__)
+#if defined(__linux__) || defined(__FreeBSD__)
 #include <IO/ReadBufferAIO.h>
 #endif
 #include <Common/ProfileEvents.h>
@@ -31,7 +31,7 @@ std::unique_ptr<ReadBufferFromFileBase> createReadBufferFromFileBase(const std::
     }
     else
     {
-#if defined(__linux__)
+#if defined(__linux__) || defined(__FreeBSD__)
         ProfileEvents::increment(ProfileEvents::CreatedReadBufferAIO);
         return std::make_unique<ReadBufferAIO>(filename_, buffer_size_, flags_, existing_memory_);
 #else

dbms/src/IO/createWriteBufferFromFileBase.cpp

@@ -1,6 +1,6 @@
 #include <IO/createWriteBufferFromFileBase.h>
 #include <IO/WriteBufferFromFile.h>
-#if defined(__linux__)
+#if defined(__linux__) || defined(__FreeBSD__)
 #include <IO/WriteBufferAIO.h>
 #endif
 #include <Common/ProfileEvents.h>
@@ -33,7 +33,7 @@ std::unique_ptr<WriteBufferFromFileBase> createWriteBufferFromFileBase(const std
     }
     else
     {
-#if defined(__linux__)
+#if defined(__linux__) || defined(__FreeBSD__)
         ProfileEvents::increment(ProfileEvents::CreatedWriteBufferAIO);
         return std::make_unique<WriteBufferAIO>(filename_, buffer_size_, flags_, mode, existing_memory_);
 #else