def dispatch_command(memory, page_tables):
cmd = raw_input('> ')
if cmd[0] == 'h':
print 'h(elp) -- print this text'
print 'a(llocate) -- request for space allocation', 'type `a\' or `a proc_name size\''
print 'r(elease) -- release space', 'type `r\' or `r proc_name block0 block1 block2 ...\''
print 'd(isplay) -- display the content of the page table'
print 'display (b)it map -- display the content of the bit map'
elif cmd[0] == 'd':
args = get_cmd(cmd, '%c &s')
if not args:
return
(proc_names,) = args
if not proc_names:
proc_names = sorted(page_tables.keys())
for name in proc_names:
if name not in page_tables:
print '%s is not a process' % name
else:
print '--', name, '--', ' page | block'
page_tables[name].display()
elif cmd[0] == 'a':
args = get_cmd(cmd, '%c %s %i', hint='proc_name size')
if not args:
return
proc_name, size = args
blocks = memory.allocate(size)
print '%s allocated' % blocks
if blocks:
page_tables[proc_name].register(blocks)
elif cmd[0] == 'r':
args = get_cmd(cmd, '%c %s &i', hint='proc_name pages')
if not args:
return
proc_name, pages = args
if not pages:
pages = page_tables[proc_name].table.keys()
page_tables[proc_name].release(*pages)
elif cmd[0] == 'b':
print 'available blocks: %s' % memory.available_block_amount
for line in take(memory.bit_map, by=8):
print line
else:
print 'unrecognized command, type `h\' for help'
def dispatch_command(hard_drive):
cmd = raw_input('> ')
if cmd[0] == 'h':
print 'h(elp) -- print this text'
print 'a(llocate) -- request for file allocation', 'type `a\' or `a filename blocks\''
print 'r(ecycle) -- recycle file', 'type `r\' or `r filename'
print 'd(isplay) -- display the content of the free space table'
print 'display (f)ile table -- display the content of the file table'
elif cmd[0] == 'a':
args = get_cmd(cmd, '%c %s %i', hint='filename blocks')
if not args:
return
ret, _ = hard_drive.allocate(*args)
if ret:
print 'allocated (track: %(track)s, cylinder: %(cylinder)s, sector: %(sector)s)' % _
else:
if _ == 0:
print 'allocation failed: not enough space'
elif _ == -1:
print 'allocation failed: file already exists'
elif cmd[0] == 'r':
args = get_cmd(cmd, '%c %s', hint='filename')
if not args:
return
(filename,) = args
ret = hard_drive.recycle(filename)
if ret:
print 'file recycle succeeded'
else:
print 'file not found'
elif cmd[0] == 'd':
print '% 10s | % 10s' % ('start', 'blocks')
for item in hard_drive._allocation_table:
print item
elif cmd[0] == 'f':
print '% 10s | % 10s | % 10s' % ('filename', 'start', 'blocks')
for filename, item in sorted(hard_drive._file_table.iteritems(), key=lambda (k, _): k):
print '% 10s | %s' % (filename, item)
def dispatch_command():
while True:
cmd = raw_input('> ')
if not len(cmd):
return None, 0
if cmd[0] == 'h':
print 'h(elp) -- print this text'
print 'c(ontinue) -- continue simulation', 'type `c\' or `c times\''
print 'n(ew pcb) -- make new PCB and push it into queue',\
'type `n\' or `n name time priority\''
print 'd(isplay) -- display the content of queue'
return 'h', 0
elif cmd[0] == 'c':
args = get_cmd(cmd, '%c &i')
if not args:
return 'c', -1
(times,) = args
if times:
return 'c', times[0]
else:
return 'c', 0
elif cmd[0] == 'n':
args = get_cmd(cmd, '%c %s %i %i', hint='proc_n t prior')
if not args:
return 'n', -1
pcb = ProcessControlBlock(*args)
queue.put((pcb.priority, pcb)) # 优先队列的使用方法是放入队伍时，
# 放入(p, i)，
# 其中p表示优先级，i表示放入的元素
return 'n', 0
elif cmd in commands:
return cmd, commands[cmd]()
else:
print 'unrecognized command, type `h\' for help'
return 'u', -1
