Banker's algorithm: Difference between revisions
Content added Content deleted
(added Perl 6 programming solution) |
SqrtNegInf (talk | contribs) m (→{{header|Perl 6}}: fewer parens, separate boolean/string in function return) |
||
| Line 897: | Line 897: | ||
=={{header|Perl 6}}== |
=={{header|Perl 6}}== |
||
<lang perl6># |
<lang perl6># Reference: |
||
# Reference: |
|||
# https://www.geeksforgeeks.org/program-bankers-algorithm-set-1-safety-algorithm/ |
# https://www.geeksforgeeks.org/program-bankers-algorithm-set-1-safety-algorithm/ |
||
# based on the Python3 solution by Shubham Singh(SHUBHAMSINGH10) |
# based on the Python3 solution by Shubham Singh(SHUBHAMSINGH10) |
||
| Line 910: | Line 908: | ||
# Maximum R that can be allocated to processes |
# Maximum R that can be allocated to processes |
||
my @maxm = |
my @maxm = <3 3 2 2>, <1 2 3 4>, <1 3 5 0>; |
||
# Resources allocated to processes |
# Resources allocated to processes |
||
my @allot = |
my @allot = <1 2 2 1>, <1 0 3 3>, <1 2 1 0>; |
||
# Function to find the system is in safe state or not |
# Function to find the system is in safe state or not |
||
sub isSafe(\processes, \avail, \maxm, \allot) { |
sub isSafe(\processes, \avail, \maxm, \allot) { |
||
my $satisfied; |
my $satisfied; |
||
my @need |
my @need; # the need matrix |
||
for ^P -> \i { # Calculating Need of each P |
for ^P -> \i { # Calculating Need of each P |
||
for ^R -> \j { # Need of instance = maxm instance - allocated instance |
for ^R -> \j { # Need of instance = maxm instance - allocated instance |
||
| Line 931: | Line 929: | ||
# While all processes are not finished or system is not in safe state |
# While all processes are not finished or system is not in safe state |
||
my $count = 0; |
my $count = 0; |
||
while |
while $count < P { # Find a process which is not finish and whose needs |
||
# can be satisfied with current @work resources. |
|||
my $found = False; |
my $found = False; |
||
for ^P -> \p { |
for ^P -> \p { |
||
# First check if a process is finished, if no, go for next condition |
# First check if a process is finished, if no, go for next condition |
||
if |
if @finish[p] == 0 { |
||
# Check if for all resources of current P need is less than work |
# Check if for all resources of current P need is less than work |
||
LOOP: for ^R -> \j { |
LOOP: for ^R -> \j { |
||
$satisfied = j; |
$satisfied = j; |
||
last LOOP if |
last LOOP if @need[p;j] > @work[j] |
||
} |
} |
||
if |
if $satisfied == R - 1 { # If all needs of p were satisfied. |
||
# Add the allocated resources of current P to the |
# Add the allocated resources of current P to the |
||
# available/work resources i.e.free the resources |
# available/work resources i.e.free the resources |
||
| Line 956: | Line 954: | ||
} |
} |
||
# If we could not find a next process in safe sequence. |
# If we could not find a next process in safe sequence. |
||
| ⚫ | |||
if ($found == False) { |
|||
| ⚫ | |||
return False |
|||
} |
|||
} |
} |
||
# If system is in safe state then safe sequence will be as below |
# If system is in safe state then safe sequence will be as below |
||
True, "Safe sequence is: " ~ @safeSeq |
|||
say "Safe sequence is: ", @safeSeq; |
|||
return True |
|||
} |
} |
||
# Check system is in safe state or not |
# Check system is in safe state or not |
||
my ($safe-state,$status-message) = isSafe @processes, @avail, @maxm, @allot; |
|||
say "Safe state? $safe-state"; |
|||
say "Message: $status-message";</lang> |
|||
{{out}} |
{{out}} |
||
<pre> |
<pre>Safe state? True |
||
Safe sequence is: |
Message: Safe sequence is: 0 1 2</pre> |
||
</pre> |
|||
=={{header|Phix}}== |
=={{header|Phix}}== |
||